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52 they have been replaced by functions in /sys.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65 they have been replaced by functions in /sys.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_INITRD_TABLE_OVERRIDE
269 This option provides functionality to override arbitrary ACPI tables
270 via initrd. No functional change if no ACPI tables are glued to the
271 initrd, therefore it's safe to say Y.
272 See Documentation/acpi/initrd_table_override.txt for details
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 EXPERT
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"
369 This driver supports the Smart Battery System, another
370 type of access to battery information, found on some laptops.
372 To compile this driver as a module, choose M here:
373 the modules will be called sbs and sbshc.
376 tristate "Hardware Error Device"
378 This driver supports the Hardware Error Device (PNP0C33),
379 which is used to report some hardware errors notified via
380 SCI, mainly the corrected errors.
382 config ACPI_CUSTOM_METHOD
383 tristate "Allow ACPI methods to be inserted/replaced at run time"
387 This debug facility allows ACPI AML methods to be inserted and/or
388 replaced without rebooting the system. For details refer to:
389 Documentation/acpi/method-customizing.txt.
391 NOTE: This option is security sensitive, because it allows arbitrary
392 kernel memory to be written to by root (uid=0) users, allowing them
393 to bypass certain security measures (e.g. if root is not allowed to
394 load additional kernel modules after boot, this feature may be used
395 to override that restriction).
397 source "drivers/acpi/apei/Kconfig"