1 Acer Laptop WMI Extras Driver
2 http://code.google.com/p/aceracpi
6 Copyright 2007-2008 Carlos Corbacho <carlos@strangeworlds.co.uk>
8 acer-wmi is a driver to allow you to control various parts of your Acer laptop
9 hardware under Linux which are exposed via ACPI-WMI.
11 This driver completely replaces the old out-of-tree acer_acpi, which I am
12 currently maintaining for bug fixes only on pre-2.6.25 kernels. All development
13 work is now focused solely on acer-wmi.
18 Acer and Wistron have provided nothing towards the development acer_acpi or
19 acer-wmi. All information we have has been through the efforts of the developers
20 and the users to discover as much as possible about the hardware.
22 As such, I do warn that this could break your hardware - this is extremely
23 unlikely of course, but please bear this in mind.
28 acer-wmi is derived from acer_acpi, originally developed by Mark
29 Smith in 2005, then taken over by Carlos Corbacho in 2007, in order to activate
30 the wireless LAN card under a 64-bit version of Linux, as acerhk[1] (the
31 previous solution to the problem) relied on making 32 bit BIOS calls which are
32 not possible in kernel space from a 64 bit OS.
34 [1] acerhk: http://www.cakey.de/acerhk/
39 Please see the website for the current list of known working hardare:
41 http://code.google.com/p/aceracpi/wiki/SupportedHardware
43 If your laptop is not listed, or listed as unknown, and works with acer-wmi,
44 please contact me with a copy of the DSDT.
46 If your Acer laptop doesn't work with acer-wmi, I would also like to see the
49 To send me the DSDT, as root/sudo:
51 cat /sys/firmware/acpi/tables/DSDT > dsdt
53 And send me the resulting 'dsdt' file.
58 On Acer laptops, acer-wmi should already be autoloaded based on DMI matching.
59 For non-Acer laptops, until WMI based autoloading support is added, you will
60 need to manually load acer-wmi.
62 acer-wmi creates /sys/devices/platform/acer-wmi, and fills it with various
63 files whose usage is detailed below, which enables you to control some of the
64 following (varies between models):
66 * the wireless LAN card radio
67 * inbuilt Bluetooth adapter
69 * mail LED of your laptop
70 * brightness of the LCD panel
75 With regards to wireless, all acer-wmi does is enable the radio on the card. It
76 is not responsible for the wireless LED - once the radio is enabled, this is
77 down to the wireless driver for your card. So the behaviour of the wireless LED,
78 once you enable the radio, will depend on your hardware and driver combination.
80 e.g. With the BCM4318 on the Acer Aspire 5020 series:
82 ndiswrapper: Light blinks on when transmitting
83 b43: Solid light, blinks off when transmitting
85 Wireless radio control is unconditionally enabled - all Acer laptops that support
86 acer-wmi come with built-in wireless. However, should you feel so inclined to
87 ever wish to remove the card, or swap it out at some point, please get in touch
88 with me, as we may well be able to gain some data on wireless card detection.
90 To read the status of the wireless radio (0=off, 1=on):
91 cat /sys/devices/platform/acer-wmi/wireless
93 To enable the wireless radio:
94 echo 1 > /sys/devices/platform/acer-wmi/wireless
96 To disable the wireless radio:
97 echo 0 > /sys/devices/platform/acer-wmi/wireless
99 To set the state of the wireless radio when loading acer-wmi, pass:
100 wireless=X (where X is 0 or 1)
105 For bluetooth, this is an internal USB dongle, so once enabled, you will get
106 a USB device connection event, and a new USB device appears. When you disable
107 bluetooth, you get the reverse - a USB device disconnect event, followed by the
108 device disappearing again.
110 Bluetooth is autodetected by acer-wmi, so if you do not have a bluetooth module
111 installed in your laptop, this file won't exist (please be aware that it is
112 quite common for Acer not to fit bluetooth to their laptops - so just because
113 you have a bluetooth button on the laptop, doesn't mean that bluetooth is
116 For the adventurously minded - if you want to buy an internal bluetooth
117 module off the internet that is compatible with your laptop and fit it, then
118 it will work just fine with acer-wmi.
120 To read the status of the bluetooth module (0=off, 1=on):
121 cat /sys/devices/platform/acer-wmi/wireless
123 To enable the bluetooth module:
124 echo 1 > /sys/devices/platform/acer-wmi/bluetooth
126 To disable the bluetooth module:
127 echo 0 > /sys/devices/platform/acer-wmi/bluetooth
129 To set the state of the bluetooth module when loading acer-wmi, pass:
130 bluetooth=X (where X is 0 or 1)
135 3G is currently not autodetected, so the 'threeg' file is always created under
136 sysfs. So far, no-one in possession of an Acer laptop with 3G built-in appears to
137 have tried Linux, or reported back, so we don't have any information on this.
139 If you have an Acer laptop that does have a 3G card in, please contact me so we
140 can properly detect these, and find out a bit more about them.
142 To read the status of the 3G card (0=off, 1=on):
143 cat /sys/devices/platform/acer-wmi/threeg
145 To enable the 3G card:
146 echo 1 > /sys/devices/platform/acer-wmi/threeg
148 To disable the 3G card:
149 echo 0 > /sys/devices/platform/acer-wmi/threeg
151 To set the state of the 3G card when loading acer-wmi, pass:
152 threeg=X (where X is 0 or 1)
157 This can be found in most older Acer laptops supported by acer-wmi, and many
158 newer ones - it is built into the 'mail' button, and blinks when active.
160 On newer (WMID) laptops though, we have no way of detecting the mail LED. If
161 your laptop identifies itself in dmesg as a WMID model, then please try loading
166 This will use a known alternative method of reading/ writing the mail LED. If
167 it works, please report back to me with the DMI data from your laptop so this
168 can be added to acer-wmi.
170 The LED is exposed through the LED subsystem, and can be found in:
172 /sys/devices/platform/acer-wmi/leds/acer-wmi::mail/
174 The mail LED is autodetected, so if you don't have one, the LED device won't
177 If you have a mail LED that is not green, please report this to me.
182 The backlight brightness control is available on all acer-wmi supported
183 hardware. The maximum brightness level is usually 15, but on some newer laptops
184 it's 10 (this is again autodetected).
186 The backlight is exposed through the backlight subsystem, and can be found in:
188 /sys/devices/platform/acer-wmi/backlight/acer-wmi/
193 Olaf Tauber, who did the real hard work when he developed acerhk
194 http://www.informatik.hu-berlin.de/~tauber/acerhk
195 All the authors of laptop ACPI modules in the kernel, whose work
196 was an inspiration in the early days of acer_acpi
197 Mathieu Segaud, who solved the problem with having to modprobe the driver
198 twice in acer_acpi 0.2.
199 Jim Ramsay, who added support for the WMID interface
200 Mark Smith, who started the original acer_acpi
202 And the many people who have used both acer_acpi and acer-wmi.