6 bool "ACPI (Advanced Configuration and Power Interface) Support"
7 depends on !IA64_HP_SIM
15 Advanced Configuration and Power Interface (ACPI) support for
16 Linux requires an ACPI-compliant platform (hardware/firmware),
17 and assumes the presence of OS-directed configuration and power
18 management (OSPM) software. This option will enlarge your
21 Linux ACPI provides a robust functional replacement for several
22 legacy configuration and power management interfaces, including
23 the Plug-and-Play BIOS specification (PnP BIOS), the
24 MultiProcessor Specification (MPS), and the Advanced Power
25 Management (APM) specification. If both ACPI and APM support
26 are configured, ACPI is used.
28 The project home page for the Linux ACPI subsystem is here:
29 <http://www.lesswatts.org/projects/acpi/>
31 Linux support for ACPI is based on Intel Corporation's ACPI
32 Component Architecture (ACPI CA). For more information on the
36 ACPI is an open industry specification co-developed by
37 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba.
38 The specification is available at:
39 <http://www.acpi.info>
45 depends on SUSPEND || HIBERNATION
49 bool "Deprecated /proc/acpi files"
52 For backwards compatibility, this option allows
53 deprecated /proc/acpi/ files to exist, even when
54 they have been replaced by functions in /sys.
55 The deprecated files (and their replacements) include:
57 /proc/acpi/processor/*/throttling (/sys/class/thermal/
59 /proc/acpi/video/*/brightness (/sys/class/backlight/)
60 /proc/acpi/thermal_zone/*/* (/sys/class/thermal/)
61 This option has no effect on /proc/acpi/ files
62 and functions which do not yet exist in /sys.
64 Say N to delete /proc/acpi/ files that have moved to /sys/
66 config ACPI_PROCFS_POWER
67 bool "Deprecated power /proc/acpi directories"
71 For backwards compatibility, this option allows
72 deprecated power /proc/acpi/ directories to exist, even when
73 they have been replaced by functions in /sys.
74 The deprecated directories (and their replacements) include:
75 /proc/acpi/battery/* (/sys/class/power_supply/*)
76 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
77 This option has no effect on /proc/acpi/ directories
78 and functions, which do not yet exist in /sys
80 Say N to delete power /proc/acpi/ directories that have moved to /sys/
82 config ACPI_POWER_METER
83 tristate "ACPI 4.0 power meter"
86 This driver exposes ACPI 4.0 power meters as hardware monitoring
87 devices. Say Y (or M) if you have a computer with ACPI 4.0 firmware
90 To compile this driver as a module, choose M here:
91 the module will be called power-meter.
93 config ACPI_SYSFS_POWER
94 bool "Future power /sys interface"
98 Say N to disable power /sys interface
100 config ACPI_EC_DEBUGFS
101 tristate "EC read/write access through /sys/kernel/debug/ec"
104 Say N to disable Embedded Controller /sys/kernel/debug interface
106 Be aware that using this interface can confuse your Embedded
107 Controller in a way that a normal reboot is not enough. You then
108 have to power of your system, and remove the laptop battery for
110 An Embedded Controller typically is available on laptops and reads
111 sensor values like battery state and temperature.
112 The kernel accesses the EC through ACPI parsed code provided by BIOS
113 tables. This option allows to access the EC directly without ACPI
115 Thus this option is a debug option that helps to write ACPI drivers
116 and can be used to identify ACPI code or EC firmware bugs.
118 config ACPI_PROC_EVENT
119 bool "Deprecated /proc/acpi/event support"
123 A user-space daemon, acpid, typically reads /proc/acpi/event
124 and handles all ACPI-generated events.
126 These events are now delivered to user-space either
127 via the input layer or as netlink events.
129 This build option enables the old code for legacy
130 user-space implementation. After some time, this will
131 be moved under CONFIG_ACPI_PROCFS, and then deleted.
133 Say Y here to retain the old behaviour. Say N if your
134 user-space is newer than kernel 2.6.23 (September 2007).
137 tristate "AC Adapter"
141 This driver supports the AC Adapter object, which indicates
142 whether a system is on AC or not. If you have a system that can
143 switch between A/C and battery, say Y.
145 To compile this driver as a module, choose M here:
146 the module will be called ac.
153 This driver adds support for battery information through
154 /proc/acpi/battery. If you have a mobile system with a battery,
157 To compile this driver as a module, choose M here:
158 the module will be called battery.
165 This driver handles events on the power, sleep, and lid buttons.
166 A daemon reads /proc/acpi/event and perform user-defined actions
167 such as shutting down the system. This is necessary for
168 software-controlled poweroff.
170 To compile this driver as a module, choose M here:
171 the module will be called button.
175 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
179 This driver implements the ACPI Extensions For Display Adapters
180 for integrated graphics devices on motherboard, as specified in
181 ACPI 2.0 Specification, Appendix B. This supports basic operations
182 such as defining the video POST device, retrieving EDID information,
183 and setting up a video output.
185 To compile this driver as a module, choose M here:
186 the module will be called video.
193 This driver supports ACPI fan devices, allowing user-mode
194 applications to perform basic fan control (on, off, status).
196 To compile this driver as a module, choose M here:
197 the module will be called fan.
201 depends on EXPERIMENTAL
203 This driver supports ACPI-controlled docking stations and removable
204 drive bays such as the IBM Ultrabay and the Dell Module Bay.
206 config ACPI_PROCESSOR
211 This driver installs ACPI as the idle handler for Linux and uses
212 ACPI C2 and C3 processor states to save power on systems that
213 support it. It is required by several flavors of cpufreq
214 performance-state drivers.
216 To compile this driver as a module, choose M here:
217 the module will be called processor.
219 config ACPI_HOTPLUG_CPU
221 depends on ACPI_PROCESSOR && HOTPLUG_CPU
222 select ACPI_CONTAINER
225 config ACPI_PROCESSOR_AGGREGATOR
226 tristate "Processor Aggregator"
227 depends on ACPI_PROCESSOR
228 depends on EXPERIMENTAL
231 ACPI 4.0 defines processor Aggregator, which enables OS to perform
232 specific processor configuration and control that applies to all
233 processors in the platform. Currently only logical processor idling
234 is defined, which is to reduce power consumption. This driver
235 supports the new device.
238 tristate "Thermal Zone"
239 depends on ACPI_PROCESSOR
243 This driver supports ACPI thermal zones. Most mobile and
244 some desktop systems support ACPI thermal zones. It is HIGHLY
245 recommended that this option be enabled, as your processor(s)
246 may be damaged without it.
248 To compile this driver as a module, choose M here:
249 the module will be called thermal.
254 depends on (X86 || IA64)
255 default y if IA64_GENERIC || IA64_SGI_SN2
257 config ACPI_CUSTOM_DSDT_FILE
258 string "Custom DSDT Table file to include"
260 depends on !STANDALONE
262 This option supports a custom DSDT by linking it into the kernel.
263 See Documentation/acpi/dsdt-override.txt
265 Enter the full path name to the file which includes the AmlCode
268 If unsure, don't enter a file name.
270 config ACPI_CUSTOM_DSDT
272 default ACPI_CUSTOM_DSDT_FILE != ""
274 config ACPI_BLACKLIST_YEAR
275 int "Disable ACPI for systems before Jan 1st this year" if X86_32
278 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
279 on platforms with DMI BIOS date before January 1st that year.
280 "acpi=force" can be used to override this mechanism.
282 Enter 0 to disable this mechanism and allow ACPI to
283 run by default no matter what the year. (default)
286 bool "Debug Statements"
289 The ACPI subsystem can produce debug output. Saying Y enables this
290 output and increases the kernel size by around 50K.
292 Use the acpi.debug_layer and acpi.debug_level kernel command-line
293 parameters documented in Documentation/acpi/debug.txt and
294 Documentation/kernel-parameters.txt to control the type and
295 amount of debug output.
297 config ACPI_DEBUG_FUNC_TRACE
298 bool "Additionally enable ACPI function tracing"
300 depends on ACPI_DEBUG
302 ACPI Debug Statements slow down ACPI processing. Function trace
303 is about half of the penalty and is rarely useful.
306 tristate "PCI slot detection driver"
310 This driver creates entries in /sys/bus/pci/slots/ for all PCI
311 slots in the system. This can help correlate PCI bus addresses,
312 i.e., segment/bus/device/function tuples, with physical slots in
313 the system. If you are unsure, say N.
315 To compile this driver as a module, choose M here:
316 the module will be called pci_slot.
319 bool "Power Management Timer Support" if EMBEDDED
323 The Power Management Timer is available on all ACPI-capable,
324 in most cases even if ACPI is unusable or blacklisted.
326 This timing source is not affected by power management features
327 like aggressive processor idling, throttling, frequency and/or
328 voltage scaling, unlike the commonly used Time Stamp Counter
331 You should nearly always say Y here because many modern
332 systems require this timer.
334 config ACPI_CONTAINER
335 tristate "Container and Module Devices (EXPERIMENTAL)"
336 depends on EXPERIMENTAL
337 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
339 This driver supports ACPI Container and Module devices (IDs
340 ACPI0004, PNP0A05, and PNP0A06).
342 This helps support hotplug of nodes, CPUs, and memory.
344 To compile this driver as a module, choose M here:
345 the module will be called container.
347 config ACPI_HOTPLUG_MEMORY
348 tristate "Memory Hotplug"
349 depends on MEMORY_HOTPLUG
352 This driver supports ACPI memory hotplug. The driver
353 fields notifications on ACPI memory devices (PNP0C80),
354 which represent memory ranges that may be onlined or
355 offlined during runtime.
357 If your hardware and firmware do not support adding or
358 removing memory devices at runtime, you need not enable
361 To compile this driver as a module, choose M here:
362 the module will be called acpi_memhotplug.
365 tristate "Smart Battery System"
368 This driver supports the Smart Battery System, another
369 type of access to battery information, found on some laptops.
371 To compile this driver as a module, choose M here:
372 the modules will be called sbs and sbshc.
375 tristate "Hardware Error Device"
377 This driver supports the Hardware Error Device (PNP0C33),
378 which is used to report some hardware errors notified via
379 SCI, mainly the corrected errors.
381 source "drivers/acpi/apei/Kconfig"