6 bool "ACPI (Advanced Configuration and Power Interface) Support"
7 depends on !IA64_HP_SIM
13 Advanced Configuration and Power Interface (ACPI) support for
14 Linux requires an ACPI-compliant platform (hardware/firmware),
15 and assumes the presence of OS-directed configuration and power
16 management (OSPM) software. This option will enlarge your
19 Linux ACPI provides a robust functional replacement for several
20 legacy configuration and power management interfaces, including
21 the Plug-and-Play BIOS specification (PnP BIOS), the
22 MultiProcessor Specification (MPS), and the Advanced Power
23 Management (APM) specification. If both ACPI and APM support
24 are configured, ACPI is used.
26 The project home page for the Linux ACPI subsystem is here:
27 <http://www.lesswatts.org/projects/acpi/>
29 Linux support for ACPI is based on Intel Corporation's ACPI
30 Component Architecture (ACPI CA). For more information on the
34 ACPI is an open industry specification co-developed by
35 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba.
36 The specification is available at:
37 <http://www.acpi.info>
43 depends on SUSPEND || HIBERNATION
47 bool "Deprecated /proc/acpi files"
50 For backwards compatibility, this option allows
51 deprecated /proc/acpi/ files to exist, even when
52 they have been replaced by functions in /sys.
54 This option has no effect on /proc/acpi/ files
55 and functions which do not yet exist in /sys.
57 Say N to delete /proc/acpi/ files that have moved to /sys/
59 config ACPI_PROCFS_POWER
60 bool "Deprecated power /proc/acpi directories"
63 For backwards compatibility, this option allows
64 deprecated power /proc/acpi/ directories to exist, even when
65 they have been replaced by functions in /sys.
66 The deprecated directories (and their replacements) include:
67 /proc/acpi/battery/* (/sys/class/power_supply/*)
68 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
69 This option has no effect on /proc/acpi/ directories
70 and functions, which do not yet exist in /sys
71 This option, together with the proc directories, will be
74 Say N to delete power /proc/acpi/ directories that have moved to /sys/
76 config ACPI_EC_DEBUGFS
77 tristate "EC read/write access through /sys/kernel/debug/ec"
80 Say N to disable Embedded Controller /sys/kernel/debug interface
82 Be aware that using this interface can confuse your Embedded
83 Controller in a way that a normal reboot is not enough. You then
84 have to power off your system, and remove the laptop battery for
86 An Embedded Controller typically is available on laptops and reads
87 sensor values like battery state and temperature.
88 The kernel accesses the EC through ACPI parsed code provided by BIOS
89 tables. This option allows to access the EC directly without ACPI
91 Thus this option is a debug option that helps to write ACPI drivers
92 and can be used to identify ACPI code or EC firmware bugs.
94 config ACPI_PROC_EVENT
95 bool "Deprecated /proc/acpi/event support"
99 A user-space daemon, acpid, typically reads /proc/acpi/event
100 and handles all ACPI-generated events.
102 These events are now delivered to user-space either
103 via the input layer or as netlink events.
105 This build option enables the old code for legacy
106 user-space implementation. After some time, this will
107 be moved under CONFIG_ACPI_PROCFS, and then deleted.
109 Say Y here to retain the old behaviour. Say N if your
110 user-space is newer than kernel 2.6.23 (September 2007).
113 tristate "AC Adapter"
118 This driver supports the AC Adapter object, which indicates
119 whether a system is on AC or not. If you have a system that can
120 switch between A/C and battery, say Y.
122 To compile this driver as a module, choose M here:
123 the module will be called ac.
131 This driver adds support for battery information through
132 /proc/acpi/battery. If you have a mobile system with a battery,
135 To compile this driver as a module, choose M here:
136 the module will be called battery.
143 This driver handles events on the power, sleep, and lid buttons.
144 A daemon reads /proc/acpi/event and perform user-defined actions
145 such as shutting down the system. This is necessary for
146 software-controlled poweroff.
148 To compile this driver as a module, choose M here:
149 the module will be called button.
153 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
157 This driver implements the ACPI Extensions For Display Adapters
158 for integrated graphics devices on motherboard, as specified in
159 ACPI 2.0 Specification, Appendix B. This supports basic operations
160 such as defining the video POST device, retrieving EDID information,
161 and setting up a video output.
163 To compile this driver as a module, choose M here:
164 the module will be called video.
171 This driver supports ACPI fan devices, allowing user-mode
172 applications to perform basic fan control (on, off, status).
174 To compile this driver as a module, choose M here:
175 the module will be called fan.
179 depends on EXPERIMENTAL
181 This driver supports ACPI-controlled docking stations and removable
182 drive bays such as the IBM Ultrabay and the Dell Module Bay.
184 config ACPI_PROCESSOR
190 This driver installs ACPI as the idle handler for Linux and uses
191 ACPI C2 and C3 processor states to save power on systems that
192 support it. It is required by several flavors of cpufreq
193 performance-state drivers.
195 To compile this driver as a module, choose M here:
196 the module will be called processor.
199 depends on EXPERIMENTAL && IPMI_SI && IPMI_HANDLER
202 This driver enables the ACPI to access the BMC controller. And it
203 uses the IPMI request/response message to communicate with BMC
204 controller, which can be found on on the server.
206 To compile this driver as a module, choose M here:
207 the module will be called as acpi_ipmi.
209 config ACPI_HOTPLUG_CPU
211 depends on ACPI_PROCESSOR && HOTPLUG_CPU
212 select ACPI_CONTAINER
215 config ACPI_PROCESSOR_AGGREGATOR
216 tristate "Processor Aggregator"
217 depends on ACPI_PROCESSOR
218 depends on EXPERIMENTAL
221 ACPI 4.0 defines processor Aggregator, which enables OS to perform
222 specific processor configuration and control that applies to all
223 processors in the platform. Currently only logical processor idling
224 is defined, which is to reduce power consumption. This driver
225 supports the new device.
228 tristate "Thermal Zone"
229 depends on ACPI_PROCESSOR
233 This driver supports ACPI thermal zones. Most mobile and
234 some desktop systems support ACPI thermal zones. It is HIGHLY
235 recommended that this option be enabled, as your processor(s)
236 may be damaged without it.
238 To compile this driver as a module, choose M here:
239 the module will be called thermal.
244 depends on (X86 || IA64)
245 default y if IA64_GENERIC || IA64_SGI_SN2
247 config ACPI_CUSTOM_DSDT_FILE
248 string "Custom DSDT Table file to include"
250 depends on !STANDALONE
252 This option supports a custom DSDT by linking it into the kernel.
253 See Documentation/acpi/dsdt-override.txt
255 Enter the full path name to the file which includes the AmlCode
258 If unsure, don't enter a file name.
260 config ACPI_CUSTOM_DSDT
262 default ACPI_CUSTOM_DSDT_FILE != ""
264 config ACPI_BLACKLIST_YEAR
265 int "Disable ACPI for systems before Jan 1st this year" if X86_32
268 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
269 on platforms with DMI BIOS date before January 1st that year.
270 "acpi=force" can be used to override this mechanism.
272 Enter 0 to disable this mechanism and allow ACPI to
273 run by default no matter what the year. (default)
276 bool "Debug Statements"
279 The ACPI subsystem can produce debug output. Saying Y enables this
280 output and increases the kernel size by around 50K.
282 Use the acpi.debug_layer and acpi.debug_level kernel command-line
283 parameters documented in Documentation/acpi/debug.txt and
284 Documentation/kernel-parameters.txt to control the type and
285 amount of debug output.
287 config ACPI_DEBUG_FUNC_TRACE
288 bool "Additionally enable ACPI function tracing"
290 depends on ACPI_DEBUG
292 ACPI Debug Statements slow down ACPI processing. Function trace
293 is about half of the penalty and is rarely useful.
296 tristate "PCI slot detection driver"
300 This driver creates entries in /sys/bus/pci/slots/ for all PCI
301 slots in the system. This can help correlate PCI bus addresses,
302 i.e., segment/bus/device/function tuples, with physical slots in
303 the system. If you are unsure, say N.
305 To compile this driver as a module, choose M here:
306 the module will be called pci_slot.
309 bool "Power Management Timer Support" if EXPERT
313 The Power Management Timer is available on all ACPI-capable,
314 in most cases even if ACPI is unusable or blacklisted.
316 This timing source is not affected by power management features
317 like aggressive processor idling, throttling, frequency and/or
318 voltage scaling, unlike the commonly used Time Stamp Counter
321 You should nearly always say Y here because many modern
322 systems require this timer.
324 config ACPI_CONTAINER
325 tristate "Container and Module Devices (EXPERIMENTAL)"
326 depends on EXPERIMENTAL
327 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
329 This driver supports ACPI Container and Module devices (IDs
330 ACPI0004, PNP0A05, and PNP0A06).
332 This helps support hotplug of nodes, CPUs, and memory.
334 To compile this driver as a module, choose M here:
335 the module will be called container.
337 config ACPI_HOTPLUG_MEMORY
338 tristate "Memory Hotplug"
339 depends on MEMORY_HOTPLUG
342 This driver supports ACPI memory hotplug. The driver
343 fields notifications on ACPI memory devices (PNP0C80),
344 which represent memory ranges that may be onlined or
345 offlined during runtime.
347 If your hardware and firmware do not support adding or
348 removing memory devices at runtime, you need not enable
351 To compile this driver as a module, choose M here:
352 the module will be called acpi_memhotplug.
355 tristate "Smart Battery System"
359 This driver supports the Smart Battery System, another
360 type of access to battery information, found on some laptops.
362 To compile this driver as a module, choose M here:
363 the modules will be called sbs and sbshc.
366 tristate "Hardware Error Device"
368 This driver supports the Hardware Error Device (PNP0C33),
369 which is used to report some hardware errors notified via
370 SCI, mainly the corrected errors.
372 config ACPI_CUSTOM_METHOD
373 tristate "Allow ACPI methods to be inserted/replaced at run time"
377 This debug facility allows ACPI AML methods to be inserted and/or
378 replaced without rebooting the system. For details refer to:
379 Documentation/acpi/method-customizing.txt.
381 NOTE: This option is security sensitive, because it allows arbitrary
382 kernel memory to be written to by root (uid=0) users, allowing them
383 to bypass certain security measures (e.g. if root is not allowed to
384 load additional kernel modules after boot, this feature may be used
385 to override that restriction).
387 source "drivers/acpi/apei/Kconfig"