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1 ThinkPad ACPI Extras Driver
3 Version 0.19
4 January 06th, 2008
6 Borislav Deianov <borislav@users.sf.net>
7 Henrique de Moraes Holschuh <hmh@hmh.eng.br>
8 http://ibm-acpi.sf.net/
11 This is a Linux driver for the IBM and Lenovo ThinkPad laptops. It
12 supports various features of these laptops which are accessible
13 through the ACPI and ACPI EC framework, but not otherwise fully
14 supported by the generic Linux ACPI drivers.
16 This driver used to be named ibm-acpi until kernel 2.6.21 and release
17 0.13-20070314. It used to be in the drivers/acpi tree, but it was
18 moved to the drivers/misc tree and renamed to thinkpad-acpi for kernel
19 2.6.22, and release 0.14.
22 Status
23 ------
25 The features currently supported are the following (see below for
26 detailed description):
28 - Fn key combinations
29 - Bluetooth enable and disable
30 - video output switching, expansion control
31 - ThinkLight on and off
32 - limited docking and undocking
33 - UltraBay eject
34 - CMOS control
35 - LED control
36 - ACPI sounds
37 - temperature sensors
38 - Experimental: embedded controller register dump
39 - LCD brightness control
40 - Volume control
41 - Fan control and monitoring: fan speed, fan enable/disable
42 - Experimental: WAN enable and disable
44 A compatibility table by model and feature is maintained on the web
45 site, http://ibm-acpi.sf.net/. I appreciate any success or failure
46 reports, especially if they add to or correct the compatibility table.
47 Please include the following information in your report:
49 - ThinkPad model name
50 - a copy of your DSDT, from /proc/acpi/dsdt
51 - a copy of the output of dmidecode, with serial numbers
52 and UUIDs masked off
53 - which driver features work and which don't
54 - the observed behavior of non-working features
56 Any other comments or patches are also more than welcome.
59 Installation
60 ------------
62 If you are compiling this driver as included in the Linux kernel
63 sources, simply enable the CONFIG_THINKPAD_ACPI option, and optionally
64 enable the CONFIG_THINKPAD_ACPI_BAY option if you want the
65 thinkpad-specific bay functionality.
67 Features
68 --------
70 The driver exports two different interfaces to userspace, which can be
71 used to access the features it provides. One is a legacy procfs-based
72 interface, which will be removed at some time in the distant future.
73 The other is a new sysfs-based interface which is not complete yet.
75 The procfs interface creates the /proc/acpi/ibm directory. There is a
76 file under that directory for each feature it supports. The procfs
77 interface is mostly frozen, and will change very little if at all: it
78 will not be extended to add any new functionality in the driver, instead
79 all new functionality will be implemented on the sysfs interface.
81 The sysfs interface tries to blend in the generic Linux sysfs subsystems
82 and classes as much as possible. Since some of these subsystems are not
83 yet ready or stabilized, it is expected that this interface will change,
84 and any and all userspace programs must deal with it.
87 Notes about the sysfs interface:
89 Unlike what was done with the procfs interface, correctness when talking
90 to the sysfs interfaces will be enforced, as will correctness in the
91 thinkpad-acpi's implementation of sysfs interfaces.
93 Also, any bugs in the thinkpad-acpi sysfs driver code or in the
94 thinkpad-acpi's implementation of the sysfs interfaces will be fixed for
95 maximum correctness, even if that means changing an interface in
96 non-compatible ways. As these interfaces mature both in the kernel and
97 in thinkpad-acpi, such changes should become quite rare.
99 Applications interfacing to the thinkpad-acpi sysfs interfaces must
100 follow all sysfs guidelines and correctly process all errors (the sysfs
101 interface makes extensive use of errors). File descriptors and open /
102 close operations to the sysfs inodes must also be properly implemented.
104 The version of thinkpad-acpi's sysfs interface is exported by the driver
105 as a driver attribute (see below).
107 Sysfs driver attributes are on the driver's sysfs attribute space,
108 for 2.6.23 this is /sys/bus/platform/drivers/thinkpad_acpi/ and
109 /sys/bus/platform/drivers/thinkpad_hwmon/
111 Sysfs device attributes are on the thinkpad_acpi device sysfs attribute
112 space, for 2.6.23 this is /sys/devices/platform/thinkpad_acpi/.
114 Sysfs device attributes for the sensors and fan are on the
115 thinkpad_hwmon device's sysfs attribute space, but you should locate it
116 looking for a hwmon device with the name attribute of "thinkpad".
118 Driver version
119 --------------
121 procfs: /proc/acpi/ibm/driver
122 sysfs driver attribute: version
124 The driver name and version. No commands can be written to this file.
126 Sysfs interface version
127 -----------------------
129 sysfs driver attribute: interface_version
131 Version of the thinkpad-acpi sysfs interface, as an unsigned long
132 (output in hex format: 0xAAAABBCC), where:
133 AAAA - major revision
134 BB - minor revision
135 CC - bugfix revision
137 The sysfs interface version changelog for the driver can be found at the
138 end of this document. Changes to the sysfs interface done by the kernel
139 subsystems are not documented here, nor are they tracked by this
140 attribute.
142 Changes to the thinkpad-acpi sysfs interface are only considered
143 non-experimental when they are submitted to Linux mainline, at which
144 point the changes in this interface are documented and interface_version
145 may be updated. If you are using any thinkpad-acpi features not yet
146 sent to mainline for merging, you do so on your own risk: these features
147 may disappear, or be implemented in a different and incompatible way by
148 the time they are merged in Linux mainline.
150 Changes that are backwards-compatible by nature (e.g. the addition of
151 attributes that do not change the way the other attributes work) do not
152 always warrant an update of interface_version. Therefore, one must
153 expect that an attribute might not be there, and deal with it properly
154 (an attribute not being there *is* a valid way to make it clear that a
155 feature is not available in sysfs).
157 Hot keys
158 --------
160 procfs: /proc/acpi/ibm/hotkey
161 sysfs device attribute: hotkey_*
163 In a ThinkPad, the ACPI HKEY handler is responsible for comunicating
164 some important events and also keyboard hot key presses to the operating
165 system. Enabling the hotkey functionality of thinkpad-acpi signals the
166 firmware that such a driver is present, and modifies how the ThinkPad
167 firmware will behave in many situations.
169 The driver enables the hot key feature automatically when loaded. The
170 feature can later be disabled and enabled back at runtime. The driver
171 will also restore the hot key feature to its previous state and mask
172 when it is unloaded.
174 When the hotkey feature is enabled and the hot key mask is set (see
175 below), the driver will report HKEY events in the following format:
177 ibm/hotkey HKEY 00000080 0000xxxx
179 Some of these events refer to hot key presses, but not all.
181 The driver will generate events over the input layer for hot keys and
182 radio switches, and over the ACPI netlink layer for other events. The
183 input layer support accepts the standard IOCTLs to remap the keycodes
184 assigned to each hot key.
186 The hot key bit mask allows some control over which hot keys generate
187 events. If a key is "masked" (bit set to 0 in the mask), the firmware
188 will handle it. If it is "unmasked", it signals the firmware that
189 thinkpad-acpi would prefer to handle it, if the firmware would be so
190 kind to allow it (and it often doesn't!).
192 Not all bits in the mask can be modified. Not all bits that can be
193 modified do anything. Not all hot keys can be individually controlled
194 by the mask. Some models do not support the mask at all, and in those
195 models, hot keys cannot be controlled individually. The behaviour of
196 the mask is, therefore, higly dependent on the ThinkPad model.
198 Note that unmasking some keys prevents their default behavior. For
199 example, if Fn+F5 is unmasked, that key will no longer enable/disable
200 Bluetooth by itself.
202 Note also that not all Fn key combinations are supported through ACPI.
203 For example, on the X40, the brightness, volume and "Access IBM" buttons
204 do not generate ACPI events even with this driver. They *can* be used
205 through the "ThinkPad Buttons" utility, see http://www.nongnu.org/tpb/
207 procfs notes:
209 The following commands can be written to the /proc/acpi/ibm/hotkey file:
211 echo enable > /proc/acpi/ibm/hotkey -- enable the hot keys feature
212 echo disable > /proc/acpi/ibm/hotkey -- disable the hot keys feature
213 echo 0xffffffff > /proc/acpi/ibm/hotkey -- enable all hot keys
214 echo 0 > /proc/acpi/ibm/hotkey -- disable all possible hot keys
215 ... any other 8-hex-digit mask ...
216 echo reset > /proc/acpi/ibm/hotkey -- restore the original mask
218 The procfs interface does not support NVRAM polling control. So as to
219 maintain maximum bug-to-bug compatibility, it does not report any masks,
220 nor does it allow one to manipulate the hot key mask when the firmware
221 does not support masks at all, even if NVRAM polling is in use.
223 sysfs notes:
225 hotkey_bios_enabled:
226 Returns the status of the hot keys feature when
227 thinkpad-acpi was loaded. Upon module unload, the hot
228 key feature status will be restored to this value.
230 0: hot keys were disabled
231 1: hot keys were enabled (unusual)
233 hotkey_bios_mask:
234 Returns the hot keys mask when thinkpad-acpi was loaded.
235 Upon module unload, the hot keys mask will be restored
236 to this value.
238 hotkey_enable:
239 Enables/disables the hot keys feature in the ACPI
240 firmware, and reports current status of the hot keys
241 feature. Has no effect on the NVRAM hot key polling
242 functionality.
244 0: disables the hot keys feature / feature disabled
245 1: enables the hot keys feature / feature enabled
247 hotkey_mask:
248 bit mask to enable driver-handling (and depending on
249 the firmware, ACPI event generation) for each hot key
250 (see above). Returns the current status of the hot keys
251 mask, and allows one to modify it.
253 Note: when NVRAM polling is active, the firmware mask
254 will be different from the value returned by
255 hotkey_mask. The driver will retain enabled bits for
256 hotkeys that are under NVRAM polling even if the
257 firmware refuses them, and will not set these bits on
258 the firmware hot key mask.
260 hotkey_all_mask:
261 bit mask that should enable event reporting for all
262 supported hot keys, when echoed to hotkey_mask above.
263 Unless you know which events need to be handled
264 passively (because the firmware *will* handle them
265 anyway), do *not* use hotkey_all_mask. Use
266 hotkey_recommended_mask, instead. You have been warned.
268 hotkey_recommended_mask:
269 bit mask that should enable event reporting for all
270 supported hot keys, except those which are always
271 handled by the firmware anyway. Echo it to
272 hotkey_mask above, to use.
274 hotkey_source_mask:
275 bit mask that selects which hot keys will the driver
276 poll the NVRAM for. This is auto-detected by the driver
277 based on the capabilities reported by the ACPI firmware,
278 but it can be overridden at runtime.
280 Hot keys whose bits are set in both hotkey_source_mask
281 and also on hotkey_mask are polled for in NVRAM. Only a
282 few hot keys are available through CMOS NVRAM polling.
284 Warning: when in NVRAM mode, the volume up/down/mute
285 keys are synthesized according to changes in the mixer,
286 so you have to use volume up or volume down to unmute,
287 as per the ThinkPad volume mixer user interface. When
288 in ACPI event mode, volume up/down/mute are reported as
289 separate events, but this behaviour may be corrected in
290 future releases of this driver, in which case the
291 ThinkPad volume mixer user interface semanthics will be
292 enforced.
294 hotkey_poll_freq:
295 frequency in Hz for hot key polling. It must be between
296 0 and 25 Hz. Polling is only carried out when strictly
297 needed.
299 Setting hotkey_poll_freq to zero disables polling, and
300 will cause hot key presses that require NVRAM polling
301 to never be reported.
303 Setting hotkey_poll_freq too low will cause repeated
304 pressings of the same hot key to be misreported as a
305 single key press, or to not even be detected at all.
306 The recommended polling frequency is 10Hz.
308 hotkey_radio_sw:
309 if the ThinkPad has a hardware radio switch, this
310 attribute will read 0 if the switch is in the "radios
311 disabled" postition, and 1 if the switch is in the
312 "radios enabled" position.
314 This attribute has poll()/select() support.
316 hotkey_report_mode:
317 Returns the state of the procfs ACPI event report mode
318 filter for hot keys. If it is set to 1 (the default),
319 all hot key presses are reported both through the input
320 layer and also as ACPI events through procfs (but not
321 through netlink). If it is set to 2, hot key presses
322 are reported only through the input layer.
324 This attribute is read-only in kernels 2.6.23 or later,
325 and read-write on earlier kernels.
327 May return -EPERM (write access locked out by module
328 parameter) or -EACCES (read-only).
330 wakeup_reason:
331 Set to 1 if the system is waking up because the user
332 requested a bay ejection. Set to 2 if the system is
333 waking up because the user requested the system to
334 undock. Set to zero for normal wake-ups or wake-ups
335 due to unknown reasons.
337 This attribute has poll()/select() support.
339 wakeup_hotunplug_complete:
340 Set to 1 if the system was waken up because of an
341 undock or bay ejection request, and that request
342 was sucessfully completed. At this point, it might
343 be useful to send the system back to sleep, at the
344 user's choice. Refer to HKEY events 0x4003 and
345 0x3003, below.
347 This attribute has poll()/select() support.
349 input layer notes:
351 A Hot key is mapped to a single input layer EV_KEY event, possibly
352 followed by an EV_MSC MSC_SCAN event that shall contain that key's scan
353 code. An EV_SYN event will always be generated to mark the end of the
354 event block.
356 Do not use the EV_MSC MSC_SCAN events to process keys. They are to be
357 used as a helper to remap keys, only. They are particularly useful when
358 remapping KEY_UNKNOWN keys.
360 The events are available in an input device, with the following id:
362 Bus: BUS_HOST
363 vendor: 0x1014 (PCI_VENDOR_ID_IBM) or
364 0x17aa (PCI_VENDOR_ID_LENOVO)
365 product: 0x5054 ("TP")
366 version: 0x4101
368 The version will have its LSB incremented if the keymap changes in a
369 backwards-compatible way. The MSB shall always be 0x41 for this input
370 device. If the MSB is not 0x41, do not use the device as described in
371 this section, as it is either something else (e.g. another input device
372 exported by a thinkpad driver, such as HDAPS) or its functionality has
373 been changed in a non-backwards compatible way.
375 Adding other event types for other functionalities shall be considered a
376 backwards-compatible change for this input device.
378 Thinkpad-acpi Hot Key event map (version 0x4101):
380 ACPI Scan
381 event code Key Notes
383 0x1001 0x00 FN+F1 -
384 0x1002 0x01 FN+F2 IBM: battery (rare)
385 Lenovo: Screen lock
387 0x1003 0x02 FN+F3 Many IBM models always report
388 this hot key, even with hot keys
389 disabled or with Fn+F3 masked
390 off
391 IBM: screen lock
392 Lenovo: battery
394 0x1004 0x03 FN+F4 Sleep button (ACPI sleep button
395 semanthics, i.e. sleep-to-RAM).
396 It is always generate some kind
397 of event, either the hot key
398 event or a ACPI sleep button
399 event. The firmware may
400 refuse to generate further FN+F4
401 key presses until a S3 or S4 ACPI
402 sleep cycle is performed or some
403 time passes.
405 0x1005 0x04 FN+F5 Radio. Enables/disables
406 the internal BlueTooth hardware
407 and W-WAN card if left in control
408 of the firmware. Does not affect
409 the WLAN card.
410 Should be used to turn on/off all
411 radios (bluetooth+W-WAN+WLAN),
412 really.
414 0x1006 0x05 FN+F6 -
416 0x1007 0x06 FN+F7 Video output cycle.
417 Do you feel lucky today?
419 0x1008 0x07 FN+F8 IBM: toggle screen expand
420 Lenovo: configure ultranav
422 0x1009 0x08 FN+F9 -
423 .. .. ..
424 0x100B 0x0A FN+F11 -
426 0x100C 0x0B FN+F12 Sleep to disk. You are always
427 supposed to handle it yourself,
428 either through the ACPI event,
429 or through a hotkey event.
430 The firmware may refuse to
431 generate further FN+F4 key
432 press events until a S3 or S4
433 ACPI sleep cycle is performed,
434 or some time passes.
436 0x100D 0x0C FN+BACKSPACE -
437 0x100E 0x0D FN+INSERT -
438 0x100F 0x0E FN+DELETE -
440 0x1010 0x0F FN+HOME Brightness up. This key is
441 always handled by the firmware
442 in IBM ThinkPads, even when
443 unmasked. Just leave it alone.
444 For Lenovo ThinkPads with a new
445 BIOS, it has to be handled either
446 by the ACPI OSI, or by userspace.
447 0x1011 0x10 FN+END Brightness down. See brightness
448 up for details.
450 0x1012 0x11 FN+PGUP Thinklight toggle. This key is
451 always handled by the firmware,
452 even when unmasked.
454 0x1013 0x12 FN+PGDOWN -
456 0x1014 0x13 FN+SPACE Zoom key
458 0x1015 0x14 VOLUME UP Internal mixer volume up. This
459 key is always handled by the
460 firmware, even when unmasked.
461 NOTE: Lenovo seems to be changing
462 this.
463 0x1016 0x15 VOLUME DOWN Internal mixer volume up. This
464 key is always handled by the
465 firmware, even when unmasked.
466 NOTE: Lenovo seems to be changing
467 this.
468 0x1017 0x16 MUTE Mute internal mixer. This
469 key is always handled by the
470 firmware, even when unmasked.
472 0x1018 0x17 THINKPAD Thinkpad/Access IBM/Lenovo key
474 0x1019 0x18 unknown
475 .. .. ..
476 0x1020 0x1F unknown
478 The ThinkPad firmware does not allow one to differentiate when most hot
479 keys are pressed or released (either that, or we don't know how to, yet).
480 For these keys, the driver generates a set of events for a key press and
481 immediately issues the same set of events for a key release. It is
482 unknown by the driver if the ThinkPad firmware triggered these events on
483 hot key press or release, but the firmware will do it for either one, not
484 both.
486 If a key is mapped to KEY_RESERVED, it generates no input events at all.
487 If a key is mapped to KEY_UNKNOWN, it generates an input event that
488 includes an scan code. If a key is mapped to anything else, it will
489 generate input device EV_KEY events.
491 Non hot-key ACPI HKEY event map:
492 0x5001 Lid closed
493 0x5002 Lid opened
494 0x7000 Radio Switch may have changed state
496 The above events are not propagated by the driver, except for legacy
497 compatibility purposes when hotkey_report_mode is set to 1.
499 0x2304 System is waking up from suspend to undock
500 0x2305 System is waking up from suspend to eject bay
501 0x2404 System is waking up from hibernation to undock
502 0x2405 System is waking up from hibernation to eject bay
504 The above events are never propagated by the driver.
506 0x3003 Bay ejection (see 0x2x05) complete, can sleep again
507 0x4003 Undocked (see 0x2x04), can sleep again
508 0x5009 Tablet swivel: switched to tablet mode
509 0x500A Tablet swivel: switched to normal mode
510 0x500B Tablet pen insterted into its storage bay
511 0x500C Tablet pen removed from its storage bay
512 0x5010 Brightness level changed (newer Lenovo BIOSes)
514 The above events are propagated by the driver.
516 Compatibility notes:
518 ibm-acpi and thinkpad-acpi 0.15 (mainline kernels before 2.6.23) never
519 supported the input layer, and sent events over the procfs ACPI event
520 interface.
522 To avoid sending duplicate events over the input layer and the ACPI
523 event interface, thinkpad-acpi 0.16 implements a module parameter
524 (hotkey_report_mode), and also a sysfs device attribute with the same
525 name.
527 Make no mistake here: userspace is expected to switch to using the input
528 layer interface of thinkpad-acpi, together with the ACPI netlink event
529 interface in kernels 2.6.23 and later, or with the ACPI procfs event
530 interface in kernels 2.6.22 and earlier.
532 If no hotkey_report_mode module parameter is specified (or it is set to
533 zero), the driver defaults to mode 1 (see below), and on kernels 2.6.22
534 and earlier, also allows one to change the hotkey_report_mode through
535 sysfs. In kernels 2.6.23 and later, where the netlink ACPI event
536 interface is available, hotkey_report_mode cannot be changed through
537 sysfs (it is read-only).
539 If the hotkey_report_mode module parameter is set to 1 or 2, it cannot
540 be changed later through sysfs (any writes will return -EPERM to signal
541 that hotkey_report_mode was locked. On 2.6.23 and later, where
542 hotkey_report_mode cannot be changed at all, writes will return -EACES).
544 hotkey_report_mode set to 1 makes the driver export through the procfs
545 ACPI event interface all hot key presses (which are *also* sent to the
546 input layer). This is a legacy compatibility behaviour, and it is also
547 the default mode of operation for the driver.
549 hotkey_report_mode set to 2 makes the driver filter out the hot key
550 presses from the procfs ACPI event interface, so these events will only
551 be sent through the input layer. Userspace that has been updated to use
552 the thinkpad-acpi input layer interface should set hotkey_report_mode to
553 2.
555 Hot key press events are never sent to the ACPI netlink event interface.
556 Really up-to-date userspace under kernel 2.6.23 and later is to use the
557 netlink interface and the input layer interface, and don't bother at all
558 with hotkey_report_mode.
561 Bluetooth
562 ---------
564 procfs: /proc/acpi/ibm/bluetooth
565 sysfs device attribute: bluetooth_enable
567 This feature shows the presence and current state of a ThinkPad
568 Bluetooth device in the internal ThinkPad CDC slot.
570 Procfs notes:
572 If Bluetooth is installed, the following commands can be used:
574 echo enable > /proc/acpi/ibm/bluetooth
575 echo disable > /proc/acpi/ibm/bluetooth
577 Sysfs notes:
579 If the Bluetooth CDC card is installed, it can be enabled /
580 disabled through the "bluetooth_enable" thinkpad-acpi device
581 attribute, and its current status can also be queried.
583 enable:
584 0: disables Bluetooth / Bluetooth is disabled
585 1: enables Bluetooth / Bluetooth is enabled.
587 Note: this interface will be probably be superseeded by the
588 generic rfkill class, so it is NOT to be considered stable yet.
590 Video output control -- /proc/acpi/ibm/video
591 --------------------------------------------
593 This feature allows control over the devices used for video output -
594 LCD, CRT or DVI (if available). The following commands are available:
596 echo lcd_enable > /proc/acpi/ibm/video
597 echo lcd_disable > /proc/acpi/ibm/video
598 echo crt_enable > /proc/acpi/ibm/video
599 echo crt_disable > /proc/acpi/ibm/video
600 echo dvi_enable > /proc/acpi/ibm/video
601 echo dvi_disable > /proc/acpi/ibm/video
602 echo auto_enable > /proc/acpi/ibm/video
603 echo auto_disable > /proc/acpi/ibm/video
604 echo expand_toggle > /proc/acpi/ibm/video
605 echo video_switch > /proc/acpi/ibm/video
607 Each video output device can be enabled or disabled individually.
608 Reading /proc/acpi/ibm/video shows the status of each device.
610 Automatic video switching can be enabled or disabled. When automatic
611 video switching is enabled, certain events (e.g. opening the lid,
612 docking or undocking) cause the video output device to change
613 automatically. While this can be useful, it also causes flickering
614 and, on the X40, video corruption. By disabling automatic switching,
615 the flickering or video corruption can be avoided.
617 The video_switch command cycles through the available video outputs
618 (it simulates the behavior of Fn-F7).
620 Video expansion can be toggled through this feature. This controls
621 whether the display is expanded to fill the entire LCD screen when a
622 mode with less than full resolution is used. Note that the current
623 video expansion status cannot be determined through this feature.
625 Note that on many models (particularly those using Radeon graphics
626 chips) the X driver configures the video card in a way which prevents
627 Fn-F7 from working. This also disables the video output switching
628 features of this driver, as it uses the same ACPI methods as
629 Fn-F7. Video switching on the console should still work.
631 UPDATE: There's now a patch for the X.org Radeon driver which
632 addresses this issue. Some people are reporting success with the patch
633 while others are still having problems. For more information:
635 https://bugs.freedesktop.org/show_bug.cgi?id=2000
637 ThinkLight control -- /proc/acpi/ibm/light
638 ------------------------------------------
640 The current status of the ThinkLight can be found in this file. A few
641 models which do not make the status available will show it as
642 "unknown". The available commands are:
644 echo on > /proc/acpi/ibm/light
645 echo off > /proc/acpi/ibm/light
647 Docking / undocking -- /proc/acpi/ibm/dock
648 ------------------------------------------
650 Docking and undocking (e.g. with the X4 UltraBase) requires some
651 actions to be taken by the operating system to safely make or break
652 the electrical connections with the dock.
654 The docking feature of this driver generates the following ACPI events:
656 ibm/dock GDCK 00000003 00000001 -- eject request
657 ibm/dock GDCK 00000003 00000002 -- undocked
658 ibm/dock GDCK 00000000 00000003 -- docked
660 NOTE: These events will only be generated if the laptop was docked
661 when originally booted. This is due to the current lack of support for
662 hot plugging of devices in the Linux ACPI framework. If the laptop was
663 booted while not in the dock, the following message is shown in the
664 logs:
666 Mar 17 01:42:34 aero kernel: thinkpad_acpi: dock device not present
668 In this case, no dock-related events are generated but the dock and
669 undock commands described below still work. They can be executed
670 manually or triggered by Fn key combinations (see the example acpid
671 configuration files included in the driver tarball package available
672 on the web site).
674 When the eject request button on the dock is pressed, the first event
675 above is generated. The handler for this event should issue the
676 following command:
678 echo undock > /proc/acpi/ibm/dock
680 After the LED on the dock goes off, it is safe to eject the laptop.
681 Note: if you pressed this key by mistake, go ahead and eject the
682 laptop, then dock it back in. Otherwise, the dock may not function as
683 expected.
685 When the laptop is docked, the third event above is generated. The
686 handler for this event should issue the following command to fully
687 enable the dock:
689 echo dock > /proc/acpi/ibm/dock
691 The contents of the /proc/acpi/ibm/dock file shows the current status
692 of the dock, as provided by the ACPI framework.
694 The docking support in this driver does not take care of enabling or
695 disabling any other devices you may have attached to the dock. For
696 example, a CD drive plugged into the UltraBase needs to be disabled or
697 enabled separately. See the provided example acpid configuration files
698 for how this can be accomplished.
700 There is no support yet for PCI devices that may be attached to a
701 docking station, e.g. in the ThinkPad Dock II. The driver currently
702 does not recognize, enable or disable such devices. This means that
703 the only docking stations currently supported are the X-series
704 UltraBase docks and "dumb" port replicators like the Mini Dock (the
705 latter don't need any ACPI support, actually).
707 UltraBay eject -- /proc/acpi/ibm/bay
708 ------------------------------------
710 Inserting or ejecting an UltraBay device requires some actions to be
711 taken by the operating system to safely make or break the electrical
712 connections with the device.
714 This feature generates the following ACPI events:
716 ibm/bay MSTR 00000003 00000000 -- eject request
717 ibm/bay MSTR 00000001 00000000 -- eject lever inserted
719 NOTE: These events will only be generated if the UltraBay was present
720 when the laptop was originally booted (on the X series, the UltraBay
721 is in the dock, so it may not be present if the laptop was undocked).
722 This is due to the current lack of support for hot plugging of devices
723 in the Linux ACPI framework. If the laptop was booted without the
724 UltraBay, the following message is shown in the logs:
726 Mar 17 01:42:34 aero kernel: thinkpad_acpi: bay device not present
728 In this case, no bay-related events are generated but the eject
729 command described below still works. It can be executed manually or
730 triggered by a hot key combination.
732 Sliding the eject lever generates the first event shown above. The
733 handler for this event should take whatever actions are necessary to
734 shut down the device in the UltraBay (e.g. call idectl), then issue
735 the following command:
737 echo eject > /proc/acpi/ibm/bay
739 After the LED on the UltraBay goes off, it is safe to pull out the
740 device.
742 When the eject lever is inserted, the second event above is
743 generated. The handler for this event should take whatever actions are
744 necessary to enable the UltraBay device (e.g. call idectl).
746 The contents of the /proc/acpi/ibm/bay file shows the current status
747 of the UltraBay, as provided by the ACPI framework.
749 EXPERIMENTAL warm eject support on the 600e/x, A22p and A3x (To use
750 this feature, you need to supply the experimental=1 parameter when
751 loading the module):
753 These models do not have a button near the UltraBay device to request
754 a hot eject but rather require the laptop to be put to sleep
755 (suspend-to-ram) before the bay device is ejected or inserted).
756 The sequence of steps to eject the device is as follows:
758 echo eject > /proc/acpi/ibm/bay
759 put the ThinkPad to sleep
760 remove the drive
761 resume from sleep
762 cat /proc/acpi/ibm/bay should show that the drive was removed
764 On the A3x, both the UltraBay 2000 and UltraBay Plus devices are
765 supported. Use "eject2" instead of "eject" for the second bay.
767 Note: the UltraBay eject support on the 600e/x, A22p and A3x is
768 EXPERIMENTAL and may not work as expected. USE WITH CAUTION!
770 CMOS control
771 ------------
773 procfs: /proc/acpi/ibm/cmos
774 sysfs device attribute: cmos_command
776 This feature is mostly used internally by the ACPI firmware to keep the legacy
777 CMOS NVRAM bits in sync with the current machine state, and to record this
778 state so that the ThinkPad will retain such settings across reboots.
780 Some of these commands actually perform actions in some ThinkPad models, but
781 this is expected to disappear more and more in newer models. As an example, in
782 a T43 and in a X40, commands 12 and 13 still control the ThinkLight state for
783 real, but commands 0 to 2 don't control the mixer anymore (they have been
784 phased out) and just update the NVRAM.
786 The range of valid cmos command numbers is 0 to 21, but not all have an
787 effect and the behavior varies from model to model. Here is the behavior
788 on the X40 (tpb is the ThinkPad Buttons utility):
790 0 - Related to "Volume down" key press
791 1 - Related to "Volume up" key press
792 2 - Related to "Mute on" key press
793 3 - Related to "Access IBM" key press
794 4 - Related to "LCD brightness up" key pess
795 5 - Related to "LCD brightness down" key press
796 11 - Related to "toggle screen expansion" key press/function
797 12 - Related to "ThinkLight on"
798 13 - Related to "ThinkLight off"
799 14 - Related to "ThinkLight" key press (toggle thinklight)
801 The cmos command interface is prone to firmware split-brain problems, as
802 in newer ThinkPads it is just a compatibility layer. Do not use it, it is
803 exported just as a debug tool.
805 LED control -- /proc/acpi/ibm/led
806 ---------------------------------
808 Some of the LED indicators can be controlled through this feature. The
809 available commands are:
811 echo '<led number> on' >/proc/acpi/ibm/led
812 echo '<led number> off' >/proc/acpi/ibm/led
813 echo '<led number> blink' >/proc/acpi/ibm/led
815 The <led number> range is 0 to 7. The set of LEDs that can be
816 controlled varies from model to model. Here is the mapping on the X40:
818 0 - power
819 1 - battery (orange)
820 2 - battery (green)
821 3 - UltraBase
822 4 - UltraBay
823 7 - standby
825 All of the above can be turned on and off and can be made to blink.
827 ACPI sounds -- /proc/acpi/ibm/beep
828 ----------------------------------
830 The BEEP method is used internally by the ACPI firmware to provide
831 audible alerts in various situations. This feature allows the same
832 sounds to be triggered manually.
834 The commands are non-negative integer numbers:
836 echo <number> >/proc/acpi/ibm/beep
838 The valid <number> range is 0 to 17. Not all numbers trigger sounds
839 and the sounds vary from model to model. Here is the behavior on the
840 X40:
842 0 - stop a sound in progress (but use 17 to stop 16)
843 2 - two beeps, pause, third beep ("low battery")
844 3 - single beep
845 4 - high, followed by low-pitched beep ("unable")
846 5 - single beep
847 6 - very high, followed by high-pitched beep ("AC/DC")
848 7 - high-pitched beep
849 9 - three short beeps
850 10 - very long beep
851 12 - low-pitched beep
852 15 - three high-pitched beeps repeating constantly, stop with 0
853 16 - one medium-pitched beep repeating constantly, stop with 17
854 17 - stop 16
856 Temperature sensors
857 -------------------
859 procfs: /proc/acpi/ibm/thermal
860 sysfs device attributes: (hwmon "thinkpad") temp*_input
862 Most ThinkPads include six or more separate temperature sensors but only
863 expose the CPU temperature through the standard ACPI methods. This
864 feature shows readings from up to eight different sensors on older
865 ThinkPads, and up to sixteen different sensors on newer ThinkPads.
867 For example, on the X40, a typical output may be:
868 temperatures: 42 42 45 41 36 -128 33 -128
870 On the T43/p, a typical output may be:
871 temperatures: 48 48 36 52 38 -128 31 -128 48 52 48 -128 -128 -128 -128 -128
873 The mapping of thermal sensors to physical locations varies depending on
874 system-board model (and thus, on ThinkPad model).
876 http://thinkwiki.org/wiki/Thermal_Sensors is a public wiki page that
877 tries to track down these locations for various models.
879 Most (newer?) models seem to follow this pattern:
881 1: CPU
882 2: (depends on model)
883 3: (depends on model)
884 4: GPU
885 5: Main battery: main sensor
886 6: Bay battery: main sensor
887 7: Main battery: secondary sensor
888 8: Bay battery: secondary sensor
889 9-15: (depends on model)
891 For the R51 (source: Thomas Gruber):
892 2: Mini-PCI
893 3: Internal HDD
895 For the T43, T43/p (source: Shmidoax/Thinkwiki.org)
896 http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_T43.2C_T43p
897 2: System board, left side (near PCMCIA slot), reported as HDAPS temp
898 3: PCMCIA slot
899 9: MCH (northbridge) to DRAM Bus
900 10: Clock-generator, mini-pci card and ICH (southbridge), under Mini-PCI
901 card, under touchpad
902 11: Power regulator, underside of system board, below F2 key
904 The A31 has a very atypical layout for the thermal sensors
905 (source: Milos Popovic, http://thinkwiki.org/wiki/Thermal_Sensors#ThinkPad_A31)
906 1: CPU
907 2: Main Battery: main sensor
908 3: Power Converter
909 4: Bay Battery: main sensor
910 5: MCH (northbridge)
911 6: PCMCIA/ambient
912 7: Main Battery: secondary sensor
913 8: Bay Battery: secondary sensor
916 Procfs notes:
917 Readings from sensors that are not available return -128.
918 No commands can be written to this file.
920 Sysfs notes:
921 Sensors that are not available return the ENXIO error. This
922 status may change at runtime, as there are hotplug thermal
923 sensors, like those inside the batteries and docks.
925 thinkpad-acpi thermal sensors are reported through the hwmon
926 subsystem, and follow all of the hwmon guidelines at
927 Documentation/hwmon.
930 EXPERIMENTAL: Embedded controller register dump -- /proc/acpi/ibm/ecdump
931 ------------------------------------------------------------------------
933 This feature is marked EXPERIMENTAL because the implementation
934 directly accesses hardware registers and may not work as expected. USE
935 WITH CAUTION! To use this feature, you need to supply the
936 experimental=1 parameter when loading the module.
938 This feature dumps the values of 256 embedded controller
939 registers. Values which have changed since the last time the registers
940 were dumped are marked with a star:
942 [root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump
943 EC +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f
944 EC 0x00: a7 47 87 01 fe 96 00 08 01 00 cb 00 00 00 40 00
945 EC 0x10: 00 00 ff ff f4 3c 87 09 01 ff 42 01 ff ff 0d 00
946 EC 0x20: 00 00 00 00 00 00 00 00 00 00 00 03 43 00 00 80
947 EC 0x30: 01 07 1a 00 30 04 00 00 *85 00 00 10 00 50 00 00
948 EC 0x40: 00 00 00 00 00 00 14 01 00 04 00 00 00 00 00 00
949 EC 0x50: 00 c0 02 0d 00 01 01 02 02 03 03 03 03 *bc *02 *bc
950 EC 0x60: *02 *bc *02 00 00 00 00 00 00 00 00 00 00 00 00 00
951 EC 0x70: 00 00 00 00 00 12 30 40 *24 *26 *2c *27 *20 80 *1f 80
952 EC 0x80: 00 00 00 06 *37 *0e 03 00 00 00 0e 07 00 00 00 00
953 EC 0x90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
954 EC 0xa0: *ff 09 ff 09 ff ff *64 00 *00 *00 *a2 41 *ff *ff *e0 00
955 EC 0xb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
956 EC 0xc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
957 EC 0xd0: 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
958 EC 0xe0: 00 00 00 00 00 00 00 00 11 20 49 04 24 06 55 03
959 EC 0xf0: 31 55 48 54 35 38 57 57 08 2f 45 73 07 65 6c 1a
961 This feature can be used to determine the register holding the fan
962 speed on some models. To do that, do the following:
964 - make sure the battery is fully charged
965 - make sure the fan is running
966 - run 'cat /proc/acpi/ibm/ecdump' several times, once per second or so
968 The first step makes sure various charging-related values don't
969 vary. The second ensures that the fan-related values do vary, since
970 the fan speed fluctuates a bit. The third will (hopefully) mark the
971 fan register with a star:
973 [root@x40 ibm-acpi]# cat /proc/acpi/ibm/ecdump
974 EC +00 +01 +02 +03 +04 +05 +06 +07 +08 +09 +0a +0b +0c +0d +0e +0f
975 EC 0x00: a7 47 87 01 fe 96 00 08 01 00 cb 00 00 00 40 00
976 EC 0x10: 00 00 ff ff f4 3c 87 09 01 ff 42 01 ff ff 0d 00
977 EC 0x20: 00 00 00 00 00 00 00 00 00 00 00 03 43 00 00 80
978 EC 0x30: 01 07 1a 00 30 04 00 00 85 00 00 10 00 50 00 00
979 EC 0x40: 00 00 00 00 00 00 14 01 00 04 00 00 00 00 00 00
980 EC 0x50: 00 c0 02 0d 00 01 01 02 02 03 03 03 03 bc 02 bc
981 EC 0x60: 02 bc 02 00 00 00 00 00 00 00 00 00 00 00 00 00
982 EC 0x70: 00 00 00 00 00 12 30 40 24 27 2c 27 21 80 1f 80
983 EC 0x80: 00 00 00 06 *be 0d 03 00 00 00 0e 07 00 00 00 00
984 EC 0x90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
985 EC 0xa0: ff 09 ff 09 ff ff 64 00 00 00 a2 41 ff ff e0 00
986 EC 0xb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
987 EC 0xc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
988 EC 0xd0: 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
989 EC 0xe0: 00 00 00 00 00 00 00 00 11 20 49 04 24 06 55 03
990 EC 0xf0: 31 55 48 54 35 38 57 57 08 2f 45 73 07 65 6c 1a
992 Another set of values that varies often is the temperature
993 readings. Since temperatures don't change vary fast, you can take
994 several quick dumps to eliminate them.
996 You can use a similar method to figure out the meaning of other
997 embedded controller registers - e.g. make sure nothing else changes
998 except the charging or discharging battery to determine which
999 registers contain the current battery capacity, etc. If you experiment
1000 with this, do send me your results (including some complete dumps with
1001 a description of the conditions when they were taken.)
1003 LCD brightness control
1004 ----------------------
1006 procfs: /proc/acpi/ibm/brightness
1007 sysfs backlight device "thinkpad_screen"
1009 This feature allows software control of the LCD brightness on ThinkPad
1010 models which don't have a hardware brightness slider.
1012 It has some limitations: the LCD backlight cannot be actually turned on or
1013 off by this interface, and in many ThinkPad models, the "dim while on
1014 battery" functionality will be enabled by the BIOS when this interface is
1015 used, and cannot be controlled.
1017 On IBM (and some of the earlier Lenovo) ThinkPads, the backlight control
1018 has eight brightness levels, ranging from 0 to 7. Some of the levels
1019 may not be distinct. Later Lenovo models that implement the ACPI
1020 display backlight brightness control methods have 16 levels, ranging
1021 from 0 to 15.
1023 There are two interfaces to the firmware for direct brightness control,
1024 EC and CMOS. To select which one should be used, use the
1025 brightness_mode module parameter: brightness_mode=1 selects EC mode,
1026 brightness_mode=2 selects CMOS mode, brightness_mode=3 selects both EC
1027 and CMOS. The driver tries to autodetect which interface to use.
1029 When display backlight brightness controls are available through the
1030 standard ACPI interface, it is best to use it instead of this direct
1031 ThinkPad-specific interface. The driver will disable its native
1032 backlight brightness control interface if it detects that the standard
1033 ACPI interface is available in the ThinkPad.
1035 The brightness_enable module parameter can be used to control whether
1036 the LCD brightness control feature will be enabled when available.
1037 brightness_enable=0 forces it to be disabled. brightness_enable=1
1038 forces it to be enabled when available, even if the standard ACPI
1039 interface is also available.
1041 Procfs notes:
1043 The available commands are:
1045 echo up >/proc/acpi/ibm/brightness
1046 echo down >/proc/acpi/ibm/brightness
1047 echo 'level <level>' >/proc/acpi/ibm/brightness
1049 Sysfs notes:
1051 The interface is implemented through the backlight sysfs class, which is
1052 poorly documented at this time.
1054 Locate the thinkpad_screen device under /sys/class/backlight, and inside
1055 it there will be the following attributes:
1057 max_brightness:
1058 Reads the maximum brightness the hardware can be set to.
1059 The minimum is always zero.
1061 actual_brightness:
1062 Reads what brightness the screen is set to at this instant.
1064 brightness:
1065 Writes request the driver to change brightness to the
1066 given value. Reads will tell you what brightness the
1067 driver is trying to set the display to when "power" is set
1068 to zero and the display has not been dimmed by a kernel
1069 power management event.
1071 power:
1072 power management mode, where 0 is "display on", and 1 to 3
1073 will dim the display backlight to brightness level 0
1074 because thinkpad-acpi cannot really turn the backlight
1075 off. Kernel power management events can temporarily
1076 increase the current power management level, i.e. they can
1077 dim the display.
1080 Volume control -- /proc/acpi/ibm/volume
1081 ---------------------------------------
1083 This feature allows volume control on ThinkPad models which don't have
1084 a hardware volume knob. The available commands are:
1086 echo up >/proc/acpi/ibm/volume
1087 echo down >/proc/acpi/ibm/volume
1088 echo mute >/proc/acpi/ibm/volume
1089 echo 'level <level>' >/proc/acpi/ibm/volume
1091 The <level> number range is 0 to 15 although not all of them may be
1092 distinct. The unmute the volume after the mute command, use either the
1093 up or down command (the level command will not unmute the volume).
1094 The current volume level and mute state is shown in the file.
1096 Fan control and monitoring: fan speed, fan enable/disable
1097 ---------------------------------------------------------
1099 procfs: /proc/acpi/ibm/fan
1100 sysfs device attributes: (hwmon "thinkpad") fan1_input, pwm1,
1101 pwm1_enable
1102 sysfs hwmon driver attributes: fan_watchdog
1104 NOTE NOTE NOTE: fan control operations are disabled by default for
1105 safety reasons. To enable them, the module parameter "fan_control=1"
1106 must be given to thinkpad-acpi.
1108 This feature attempts to show the current fan speed, control mode and
1109 other fan data that might be available. The speed is read directly
1110 from the hardware registers of the embedded controller. This is known
1111 to work on later R, T, X and Z series ThinkPads but may show a bogus
1112 value on other models.
1114 Fan levels:
1116 Most ThinkPad fans work in "levels" at the firmware interface. Level 0
1117 stops the fan. The higher the level, the higher the fan speed, although
1118 adjacent levels often map to the same fan speed. 7 is the highest
1119 level, where the fan reaches the maximum recommended speed.
1121 Level "auto" means the EC changes the fan level according to some
1122 internal algorithm, usually based on readings from the thermal sensors.
1124 There is also a "full-speed" level, also known as "disengaged" level.
1125 In this level, the EC disables the speed-locked closed-loop fan control,
1126 and drives the fan as fast as it can go, which might exceed hardware
1127 limits, so use this level with caution.
1129 The fan usually ramps up or down slowly from one speed to another, and
1130 it is normal for the EC to take several seconds to react to fan
1131 commands. The full-speed level may take up to two minutes to ramp up to
1132 maximum speed, and in some ThinkPads, the tachometer readings go stale
1133 while the EC is transitioning to the full-speed level.
1135 WARNING WARNING WARNING: do not leave the fan disabled unless you are
1136 monitoring all of the temperature sensor readings and you are ready to
1137 enable it if necessary to avoid overheating.
1139 An enabled fan in level "auto" may stop spinning if the EC decides the
1140 ThinkPad is cool enough and doesn't need the extra airflow. This is
1141 normal, and the EC will spin the fan up if the various thermal readings
1142 rise too much.
1144 On the X40, this seems to depend on the CPU and HDD temperatures.
1145 Specifically, the fan is turned on when either the CPU temperature
1146 climbs to 56 degrees or the HDD temperature climbs to 46 degrees. The
1147 fan is turned off when the CPU temperature drops to 49 degrees and the
1148 HDD temperature drops to 41 degrees. These thresholds cannot
1149 currently be controlled.
1151 The ThinkPad's ACPI DSDT code will reprogram the fan on its own when
1152 certain conditions are met. It will override any fan programming done
1153 through thinkpad-acpi.
1155 The thinkpad-acpi kernel driver can be programmed to revert the fan
1156 level to a safe setting if userspace does not issue one of the procfs
1157 fan commands: "enable", "disable", "level" or "watchdog", or if there
1158 are no writes to pwm1_enable (or to pwm1 *if and only if* pwm1_enable is
1159 set to 1, manual mode) within a configurable amount of time of up to
1160 120 seconds. This functionality is called fan safety watchdog.
1162 Note that the watchdog timer stops after it enables the fan. It will be
1163 rearmed again automatically (using the same interval) when one of the
1164 above mentioned fan commands is received. The fan watchdog is,
1165 therefore, not suitable to protect against fan mode changes made through
1166 means other than the "enable", "disable", and "level" procfs fan
1167 commands, or the hwmon fan control sysfs interface.
1169 Procfs notes:
1171 The fan may be enabled or disabled with the following commands:
1173 echo enable >/proc/acpi/ibm/fan
1174 echo disable >/proc/acpi/ibm/fan
1176 Placing a fan on level 0 is the same as disabling it. Enabling a fan
1177 will try to place it in a safe level if it is too slow or disabled.
1179 The fan level can be controlled with the command:
1181 echo 'level <level>' > /proc/acpi/ibm/fan
1183 Where <level> is an integer from 0 to 7, or one of the words "auto" or
1184 "full-speed" (without the quotes). Not all ThinkPads support the "auto"
1185 and "full-speed" levels. The driver accepts "disengaged" as an alias for
1186 "full-speed", and reports it as "disengaged" for backwards
1187 compatibility.
1189 On the X31 and X40 (and ONLY on those models), the fan speed can be
1190 controlled to a certain degree. Once the fan is running, it can be
1191 forced to run faster or slower with the following command:
1193 echo 'speed <speed>' > /proc/acpi/ibm/fan
1195 The sustainable range of fan speeds on the X40 appears to be from about
1196 3700 to about 7350. Values outside this range either do not have any
1197 effect or the fan speed eventually settles somewhere in that range. The
1198 fan cannot be stopped or started with this command. This functionality
1199 is incomplete, and not available through the sysfs interface.
1201 To program the safety watchdog, use the "watchdog" command.
1203 echo 'watchdog <interval in seconds>' > /proc/acpi/ibm/fan
1205 If you want to disable the watchdog, use 0 as the interval.
1207 Sysfs notes:
1209 The sysfs interface follows the hwmon subsystem guidelines for the most
1210 part, and the exception is the fan safety watchdog.
1212 Writes to any of the sysfs attributes may return the EINVAL error if
1213 that operation is not supported in a given ThinkPad or if the parameter
1214 is out-of-bounds, and EPERM if it is forbidden. They may also return
1215 EINTR (interrupted system call), and EIO (I/O error while trying to talk
1216 to the firmware).
1218 Features not yet implemented by the driver return ENOSYS.
1220 hwmon device attribute pwm1_enable:
1221 0: PWM offline (fan is set to full-speed mode)
1222 1: Manual PWM control (use pwm1 to set fan level)
1223 2: Hardware PWM control (EC "auto" mode)
1224 3: reserved (Software PWM control, not implemented yet)
1226 Modes 0 and 2 are not supported by all ThinkPads, and the
1227 driver is not always able to detect this. If it does know a
1228 mode is unsupported, it will return -EINVAL.
1230 hwmon device attribute pwm1:
1231 Fan level, scaled from the firmware values of 0-7 to the hwmon
1232 scale of 0-255. 0 means fan stopped, 255 means highest normal
1233 speed (level 7).
1235 This attribute only commands the fan if pmw1_enable is set to 1
1236 (manual PWM control).
1238 hwmon device attribute fan1_input:
1239 Fan tachometer reading, in RPM. May go stale on certain
1240 ThinkPads while the EC transitions the PWM to offline mode,
1241 which can take up to two minutes. May return rubbish on older
1242 ThinkPads.
1244 hwmon driver attribute fan_watchdog:
1245 Fan safety watchdog timer interval, in seconds. Minimum is
1246 1 second, maximum is 120 seconds. 0 disables the watchdog.
1248 To stop the fan: set pwm1 to zero, and pwm1_enable to 1.
1250 To start the fan in a safe mode: set pwm1_enable to 2. If that fails
1251 with EINVAL, try to set pwm1_enable to 1 and pwm1 to at least 128 (255
1252 would be the safest choice, though).
1255 EXPERIMENTAL: WAN
1256 -----------------
1258 procfs: /proc/acpi/ibm/wan
1259 sysfs device attribute: wwan_enable
1261 This feature is marked EXPERIMENTAL because the implementation
1262 directly accesses hardware registers and may not work as expected. USE
1263 WITH CAUTION! To use this feature, you need to supply the
1264 experimental=1 parameter when loading the module.
1266 This feature shows the presence and current state of a W-WAN (Sierra
1267 Wireless EV-DO) device.
1269 It was tested on a Lenovo Thinkpad X60. It should probably work on other
1270 Thinkpad models which come with this module installed.
1272 Procfs notes:
1274 If the W-WAN card is installed, the following commands can be used:
1276 echo enable > /proc/acpi/ibm/wan
1277 echo disable > /proc/acpi/ibm/wan
1279 Sysfs notes:
1281 If the W-WAN card is installed, it can be enabled /
1282 disabled through the "wwan_enable" thinkpad-acpi device
1283 attribute, and its current status can also be queried.
1285 enable:
1286 0: disables WWAN card / WWAN card is disabled
1287 1: enables WWAN card / WWAN card is enabled.
1289 Note: this interface will be probably be superseeded by the
1290 generic rfkill class, so it is NOT to be considered stable yet.
1292 Multiple Commands, Module Parameters
1293 ------------------------------------
1295 Multiple commands can be written to the proc files in one shot by
1296 separating them with commas, for example:
1298 echo enable,0xffff > /proc/acpi/ibm/hotkey
1299 echo lcd_disable,crt_enable > /proc/acpi/ibm/video
1301 Commands can also be specified when loading the thinkpad-acpi module,
1302 for example:
1304 modprobe thinkpad_acpi hotkey=enable,0xffff video=auto_disable
1306 Enabling debugging output
1307 -------------------------
1309 The module takes a debug parameter which can be used to selectively
1310 enable various classes of debugging output, for example:
1312 modprobe ibm_acpi debug=0xffff
1314 will enable all debugging output classes. It takes a bitmask, so
1315 to enable more than one output class, just add their values.
1317 Debug bitmask Description
1318 0x0001 Initialization and probing
1319 0x0002 Removal
1321 There is also a kernel build option to enable more debugging
1322 information, which may be necessary to debug driver problems.
1324 The level of debugging information output by the driver can be changed
1325 at runtime through sysfs, using the driver attribute debug_level. The
1326 attribute takes the same bitmask as the debug module parameter above.
1328 Force loading of module
1329 -----------------------
1331 If thinkpad-acpi refuses to detect your ThinkPad, you can try to specify
1332 the module parameter force_load=1. Regardless of whether this works or
1333 not, please contact ibm-acpi-devel@lists.sourceforge.net with a report.
1336 Sysfs interface changelog:
1338 0x000100: Initial sysfs support, as a single platform driver and
1339 device.
1340 0x000200: Hot key support for 32 hot keys, and radio slider switch
1341 support.
1342 0x010000: Hot keys are now handled by default over the input
1343 layer, the radio switch generates input event EV_RADIO,
1344 and the driver enables hot key handling by default in
1345 the firmware.
1347 0x020000: ABI fix: added a separate hwmon platform device and
1348 driver, which must be located by name (thinkpad)
1349 and the hwmon class for libsensors4 (lm-sensors 3)
1350 compatibility. Moved all hwmon attributes to this
1351 new platform device.
1353 0x020100: Marker for thinkpad-acpi with hot key NVRAM polling
1354 support. If you must, use it to know you should not
1355 start an userspace NVRAM poller (allows to detect when
1356 NVRAM is compiled out by the user because it is
1357 unneeded/undesired in the first place).
1358 0x020101: Marker for thinkpad-acpi with hot key NVRAM polling
1359 and proper hotkey_mask semanthics (version 8 of the
1360 NVRAM polling patch). Some development snapshots of
1361 0.18 had an earlier version that did strange things
1362 to hotkey_mask.
1364 0x020200: Add poll()/select() support to the following attributes:
1365 hotkey_radio_sw, wakeup_hotunplug_complete, wakeup_reason