6 bool "ACPI (Advanced Configuration and Power Interface) Support"
7 depends on !IA64_HP_SIM
14 Advanced Configuration and Power Interface (ACPI) support for
15 Linux requires an ACPI-compliant platform (hardware/firmware),
16 and assumes the presence of OS-directed configuration and power
17 management (OSPM) software. This option will enlarge your
20 Linux ACPI provides a robust functional replacement for several
21 legacy configuration and power management interfaces, including
22 the Plug-and-Play BIOS specification (PnP BIOS), the
23 MultiProcessor Specification (MPS), and the Advanced Power
24 Management (APM) specification. If both ACPI and APM support
25 are configured, ACPI is used.
27 The project home page for the Linux ACPI subsystem is here:
28 <http://www.lesswatts.org/projects/acpi/>
30 Linux support for ACPI is based on Intel Corporation's ACPI
31 Component Architecture (ACPI CA). For more information on the
35 ACPI is an open industry specification co-developed by
36 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba.
37 The specification is available at:
38 <http://www.acpi.info>
44 depends on SUSPEND || HIBERNATION
48 bool "Deprecated /proc/acpi files"
51 For backwards compatibility, this option allows
52 deprecated /proc/acpi/ files to exist, even when
53 they have been replaced by functions in /sys.
54 The deprecated files (and their replacements) include:
56 /proc/acpi/processor/*/throttling (/sys/class/thermal/
58 /proc/acpi/video/*/brightness (/sys/class/backlight/)
59 /proc/acpi/thermal_zone/*/* (/sys/class/thermal/)
60 This option has no effect on /proc/acpi/ files
61 and functions which do not yet exist in /sys.
63 Say N to delete /proc/acpi/ files that have moved to /sys/
65 config ACPI_PROCFS_POWER
66 bool "Deprecated power /proc/acpi directories"
69 For backwards compatibility, this option allows
70 deprecated power /proc/acpi/ directories to exist, even when
71 they have been replaced by functions in /sys.
72 The deprecated directories (and their replacements) include:
73 /proc/acpi/battery/* (/sys/class/power_supply/*)
74 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
75 This option has no effect on /proc/acpi/ directories
76 and functions, which do not yet exist in /sys
78 Say N to delete power /proc/acpi/ directories that have moved to /sys/
80 config ACPI_POWER_METER
81 tristate "ACPI 4.0 power meter"
84 This driver exposes ACPI 4.0 power meters as hardware monitoring
85 devices. Say Y (or M) if you have a computer with ACPI 4.0 firmware
88 To compile this driver as a module, choose M here:
89 the module will be called power-meter.
91 config ACPI_EC_DEBUGFS
92 tristate "EC read/write access through /sys/kernel/debug/ec"
95 Say N to disable Embedded Controller /sys/kernel/debug interface
97 Be aware that using this interface can confuse your Embedded
98 Controller in a way that a normal reboot is not enough. You then
99 have to power off your system, and remove the laptop battery for
101 An Embedded Controller typically is available on laptops and reads
102 sensor values like battery state and temperature.
103 The kernel accesses the EC through ACPI parsed code provided by BIOS
104 tables. This option allows to access the EC directly without ACPI
106 Thus this option is a debug option that helps to write ACPI drivers
107 and can be used to identify ACPI code or EC firmware bugs.
109 config ACPI_PROC_EVENT
110 bool "Deprecated /proc/acpi/event support"
114 A user-space daemon, acpid, typically reads /proc/acpi/event
115 and handles all ACPI-generated events.
117 These events are now delivered to user-space either
118 via the input layer or as netlink events.
120 This build option enables the old code for legacy
121 user-space implementation. After some time, this will
122 be moved under CONFIG_ACPI_PROCFS, and then deleted.
124 Say Y here to retain the old behaviour. Say N if your
125 user-space is newer than kernel 2.6.23 (September 2007).
128 tristate "AC Adapter"
133 This driver supports the AC Adapter object, which indicates
134 whether a system is on AC or not. If you have a system that can
135 switch between A/C and battery, say Y.
137 To compile this driver as a module, choose M here:
138 the module will be called ac.
146 This driver adds support for battery information through
147 /proc/acpi/battery. If you have a mobile system with a battery,
150 To compile this driver as a module, choose M here:
151 the module will be called battery.
158 This driver handles events on the power, sleep, and lid buttons.
159 A daemon reads /proc/acpi/event and perform user-defined actions
160 such as shutting down the system. This is necessary for
161 software-controlled poweroff.
163 To compile this driver as a module, choose M here:
164 the module will be called button.
168 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
172 This driver implements the ACPI Extensions For Display Adapters
173 for integrated graphics devices on motherboard, as specified in
174 ACPI 2.0 Specification, Appendix B. This supports basic operations
175 such as defining the video POST device, retrieving EDID information,
176 and setting up a video output.
178 To compile this driver as a module, choose M here:
179 the module will be called video.
186 This driver supports ACPI fan devices, allowing user-mode
187 applications to perform basic fan control (on, off, status).
189 To compile this driver as a module, choose M here:
190 the module will be called fan.
194 depends on EXPERIMENTAL
196 This driver supports ACPI-controlled docking stations and removable
197 drive bays such as the IBM Ultrabay and the Dell Module Bay.
199 config ACPI_PROCESSOR
205 This driver installs ACPI as the idle handler for Linux and uses
206 ACPI C2 and C3 processor states to save power on systems that
207 support it. It is required by several flavors of cpufreq
208 performance-state drivers.
210 To compile this driver as a module, choose M here:
211 the module will be called processor.
213 config ACPI_HOTPLUG_CPU
215 depends on ACPI_PROCESSOR && HOTPLUG_CPU
216 select ACPI_CONTAINER
219 config ACPI_PROCESSOR_AGGREGATOR
220 tristate "Processor Aggregator"
221 depends on ACPI_PROCESSOR
222 depends on EXPERIMENTAL
225 ACPI 4.0 defines processor Aggregator, which enables OS to perform
226 specific processor configuration and control that applies to all
227 processors in the platform. Currently only logical processor idling
228 is defined, which is to reduce power consumption. This driver
229 supports the new device.
232 tristate "Thermal Zone"
233 depends on ACPI_PROCESSOR
237 This driver supports ACPI thermal zones. Most mobile and
238 some desktop systems support ACPI thermal zones. It is HIGHLY
239 recommended that this option be enabled, as your processor(s)
240 may be damaged without it.
242 To compile this driver as a module, choose M here:
243 the module will be called thermal.
248 depends on (X86 || IA64)
249 default y if IA64_GENERIC || IA64_SGI_SN2
251 config ACPI_CUSTOM_DSDT_FILE
252 string "Custom DSDT Table file to include"
254 depends on !STANDALONE
256 This option supports a custom DSDT by linking it into the kernel.
257 See Documentation/acpi/dsdt-override.txt
259 Enter the full path name to the file which includes the AmlCode
262 If unsure, don't enter a file name.
264 config ACPI_CUSTOM_DSDT
266 default ACPI_CUSTOM_DSDT_FILE != ""
268 config ACPI_BLACKLIST_YEAR
269 int "Disable ACPI for systems before Jan 1st this year" if X86_32
272 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
273 on platforms with DMI BIOS date before January 1st that year.
274 "acpi=force" can be used to override this mechanism.
276 Enter 0 to disable this mechanism and allow ACPI to
277 run by default no matter what the year. (default)
280 bool "Debug Statements"
283 The ACPI subsystem can produce debug output. Saying Y enables this
284 output and increases the kernel size by around 50K.
286 Use the acpi.debug_layer and acpi.debug_level kernel command-line
287 parameters documented in Documentation/acpi/debug.txt and
288 Documentation/kernel-parameters.txt to control the type and
289 amount of debug output.
291 config ACPI_DEBUG_FUNC_TRACE
292 bool "Additionally enable ACPI function tracing"
294 depends on ACPI_DEBUG
296 ACPI Debug Statements slow down ACPI processing. Function trace
297 is about half of the penalty and is rarely useful.
300 tristate "PCI slot detection driver"
304 This driver creates entries in /sys/bus/pci/slots/ for all PCI
305 slots in the system. This can help correlate PCI bus addresses,
306 i.e., segment/bus/device/function tuples, with physical slots in
307 the system. If you are unsure, say N.
309 To compile this driver as a module, choose M here:
310 the module will be called pci_slot.
313 bool "Power Management Timer Support" if EMBEDDED
317 The Power Management Timer is available on all ACPI-capable,
318 in most cases even if ACPI is unusable or blacklisted.
320 This timing source is not affected by power management features
321 like aggressive processor idling, throttling, frequency and/or
322 voltage scaling, unlike the commonly used Time Stamp Counter
325 You should nearly always say Y here because many modern
326 systems require this timer.
328 config ACPI_CONTAINER
329 tristate "Container and Module Devices (EXPERIMENTAL)"
330 depends on EXPERIMENTAL
331 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
333 This driver supports ACPI Container and Module devices (IDs
334 ACPI0004, PNP0A05, and PNP0A06).
336 This helps support hotplug of nodes, CPUs, and memory.
338 To compile this driver as a module, choose M here:
339 the module will be called container.
341 config ACPI_HOTPLUG_MEMORY
342 tristate "Memory Hotplug"
343 depends on MEMORY_HOTPLUG
346 This driver supports ACPI memory hotplug. The driver
347 fields notifications on ACPI memory devices (PNP0C80),
348 which represent memory ranges that may be onlined or
349 offlined during runtime.
351 If your hardware and firmware do not support adding or
352 removing memory devices at runtime, you need not enable
355 To compile this driver as a module, choose M here:
356 the module will be called acpi_memhotplug.
359 tristate "Smart Battery System"
363 This driver supports the Smart Battery System, another
364 type of access to battery information, found on some laptops.
366 To compile this driver as a module, choose M here:
367 the modules will be called sbs and sbshc.
370 tristate "Hardware Error Device"
372 This driver supports the Hardware Error Device (PNP0C33),
373 which is used to report some hardware errors notified via
374 SCI, mainly the corrected errors.
376 source "drivers/acpi/apei/Kconfig"