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53 they have been replaced by functions in /sys.
55 This option has no effect on /proc/acpi/ files
56 and functions which do not yet exist in /sys.
58 Say N to delete /proc/acpi/ files that have moved to /sys/
60 config ACPI_PROCFS_POWER
61 bool "Deprecated power /proc/acpi directories"
64 For backwards compatibility, this option allows
65 deprecated power /proc/acpi/ directories to exist, even when
66 they have been replaced by functions in /sys.
67 The deprecated directories (and their replacements) include:
68 /proc/acpi/battery/* (/sys/class/power_supply/*)
69 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
70 This option has no effect on /proc/acpi/ directories
71 and functions, which do not yet exist in /sys
72 This option, together with the proc directories, will be
75 Say N to delete power /proc/acpi/ directories that have moved to /sys/
77 config ACPI_POWER_METER
78 tristate "ACPI 4.0 power meter"
81 This driver exposes ACPI 4.0 power meters as hardware monitoring
82 devices. Say Y (or M) if you have a computer with ACPI 4.0 firmware
85 To compile this driver as a module, choose M here:
86 the module will be called power-meter.
88 config ACPI_EC_DEBUGFS
89 tristate "EC read/write access through /sys/kernel/debug/ec"
92 Say N to disable Embedded Controller /sys/kernel/debug interface
94 Be aware that using this interface can confuse your Embedded
95 Controller in a way that a normal reboot is not enough. You then
96 have to power off your system, and remove the laptop battery for
98 An Embedded Controller typically is available on laptops and reads
99 sensor values like battery state and temperature.
100 The kernel accesses the EC through ACPI parsed code provided by BIOS
101 tables. This option allows to access the EC directly without ACPI
103 Thus this option is a debug option that helps to write ACPI drivers
104 and can be used to identify ACPI code or EC firmware bugs.
106 config ACPI_PROC_EVENT
107 bool "Deprecated /proc/acpi/event support"
111 A user-space daemon, acpid, typically reads /proc/acpi/event
112 and handles all ACPI-generated events.
114 These events are now delivered to user-space either
115 via the input layer or as netlink events.
117 This build option enables the old code for legacy
118 user-space implementation. After some time, this will
119 be moved under CONFIG_ACPI_PROCFS, and then deleted.
121 Say Y here to retain the old behaviour. Say N if your
122 user-space is newer than kernel 2.6.23 (September 2007).
125 tristate "AC Adapter"
130 This driver supports the AC Adapter object, which indicates
131 whether a system is on AC or not. If you have a system that can
132 switch between A/C and battery, say Y.
134 To compile this driver as a module, choose M here:
135 the module will be called ac.
143 This driver adds support for battery information through
144 /proc/acpi/battery. If you have a mobile system with a battery,
147 To compile this driver as a module, choose M here:
148 the module will be called battery.
155 This driver handles events on the power, sleep, and lid buttons.
156 A daemon reads /proc/acpi/event and perform user-defined actions
157 such as shutting down the system. This is necessary for
158 software-controlled poweroff.
160 To compile this driver as a module, choose M here:
161 the module will be called button.
165 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
169 This driver implements the ACPI Extensions For Display Adapters
170 for integrated graphics devices on motherboard, as specified in
171 ACPI 2.0 Specification, Appendix B. This supports basic operations
172 such as defining the video POST device, retrieving EDID information,
173 and setting up a video output.
175 To compile this driver as a module, choose M here:
176 the module will be called video.
183 This driver supports ACPI fan devices, allowing user-mode
184 applications to perform basic fan control (on, off, status).
186 To compile this driver as a module, choose M here:
187 the module will be called fan.
191 depends on EXPERIMENTAL
193 This driver supports ACPI-controlled docking stations and removable
194 drive bays such as the IBM Ultrabay and the Dell Module Bay.
196 config ACPI_PROCESSOR
202 This driver installs ACPI as the idle handler for Linux and uses
203 ACPI C2 and C3 processor states to save power on systems that
204 support it. It is required by several flavors of cpufreq
205 performance-state drivers.
207 To compile this driver as a module, choose M here:
208 the module will be called processor.
211 depends on EXPERIMENTAL && IPMI_SI && IPMI_HANDLER
214 This driver enables the ACPI to access the BMC controller. And it
215 uses the IPMI request/response message to communicate with BMC
216 controller, which can be found on on the server.
218 To compile this driver as a module, choose M here:
219 the module will be called as acpi_ipmi.
221 config ACPI_HOTPLUG_CPU
223 depends on ACPI_PROCESSOR && HOTPLUG_CPU
224 select ACPI_CONTAINER
227 config ACPI_PROCESSOR_AGGREGATOR
228 tristate "Processor Aggregator"
229 depends on ACPI_PROCESSOR
230 depends on EXPERIMENTAL
233 ACPI 4.0 defines processor Aggregator, which enables OS to perform
234 specific processor configuration and control that applies to all
235 processors in the platform. Currently only logical processor idling
236 is defined, which is to reduce power consumption. This driver
237 supports the new device.
240 tristate "Thermal Zone"
241 depends on ACPI_PROCESSOR
245 This driver supports ACPI thermal zones. Most mobile and
246 some desktop systems support ACPI thermal zones. It is HIGHLY
247 recommended that this option be enabled, as your processor(s)
248 may be damaged without it.
250 To compile this driver as a module, choose M here:
251 the module will be called thermal.
256 depends on (X86 || IA64)
257 default y if IA64_GENERIC || IA64_SGI_SN2
259 config ACPI_CUSTOM_DSDT_FILE
260 string "Custom DSDT Table file to include"
262 depends on !STANDALONE
264 This option supports a custom DSDT by linking it into the kernel.
265 See Documentation/acpi/dsdt-override.txt
267 Enter the full path name to the file which includes the AmlCode
270 If unsure, don't enter a file name.
272 config ACPI_CUSTOM_DSDT
274 default ACPI_CUSTOM_DSDT_FILE != ""
276 config ACPI_BLACKLIST_YEAR
277 int "Disable ACPI for systems before Jan 1st this year" if X86_32
280 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
281 on platforms with DMI BIOS date before January 1st that year.
282 "acpi=force" can be used to override this mechanism.
284 Enter 0 to disable this mechanism and allow ACPI to
285 run by default no matter what the year. (default)
288 bool "Debug Statements"
291 The ACPI subsystem can produce debug output. Saying Y enables this
292 output and increases the kernel size by around 50K.
294 Use the acpi.debug_layer and acpi.debug_level kernel command-line
295 parameters documented in Documentation/acpi/debug.txt and
296 Documentation/kernel-parameters.txt to control the type and
297 amount of debug output.
299 config ACPI_DEBUG_FUNC_TRACE
300 bool "Additionally enable ACPI function tracing"
302 depends on ACPI_DEBUG
304 ACPI Debug Statements slow down ACPI processing. Function trace
305 is about half of the penalty and is rarely useful.
308 tristate "PCI slot detection driver"
312 This driver creates entries in /sys/bus/pci/slots/ for all PCI
313 slots in the system. This can help correlate PCI bus addresses,
314 i.e., segment/bus/device/function tuples, with physical slots in
315 the system. If you are unsure, say N.
317 To compile this driver as a module, choose M here:
318 the module will be called pci_slot.
321 bool "Power Management Timer Support" if EXPERT
325 The Power Management Timer is available on all ACPI-capable,
326 in most cases even if ACPI is unusable or blacklisted.
328 This timing source is not affected by power management features
329 like aggressive processor idling, throttling, frequency and/or
330 voltage scaling, unlike the commonly used Time Stamp Counter
333 You should nearly always say Y here because many modern
334 systems require this timer.
336 config ACPI_CONTAINER
337 tristate "Container and Module Devices (EXPERIMENTAL)"
338 depends on EXPERIMENTAL
339 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
341 This driver supports ACPI Container and Module devices (IDs
342 ACPI0004, PNP0A05, and PNP0A06).
344 This helps support hotplug of nodes, CPUs, and memory.
346 To compile this driver as a module, choose M here:
347 the module will be called container.
349 config ACPI_HOTPLUG_MEMORY
350 tristate "Memory Hotplug"
351 depends on MEMORY_HOTPLUG
354 This driver supports ACPI memory hotplug. The driver
355 fields notifications on ACPI memory devices (PNP0C80),
356 which represent memory ranges that may be onlined or
357 offlined during runtime.
359 If your hardware and firmware do not support adding or
360 removing memory devices at runtime, you need not enable
363 To compile this driver as a module, choose M here:
364 the module will be called acpi_memhotplug.
367 tristate "Smart Battery System"
371 This driver supports the Smart Battery System, another
372 type of access to battery information, found on some laptops.
374 To compile this driver as a module, choose M here:
375 the modules will be called sbs and sbshc.
378 tristate "Hardware Error Device"
380 This driver supports the Hardware Error Device (PNP0C33),
381 which is used to report some hardware errors notified via
382 SCI, mainly the corrected errors.
384 source "drivers/acpi/apei/Kconfig"