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52 they have been replaced by functions in /sys.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65 they have been replaced by functions in /sys.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_POWER_METER
77 tristate "ACPI 4.0 power meter"
80 This driver exposes ACPI 4.0 power meters as hardware monitoring
81 devices. Say Y (or M) if you have a computer with ACPI 4.0 firmware
84 To compile this driver as a module, choose M here:
85 the module will be called power-meter.
87 config ACPI_EC_DEBUGFS
88 tristate "EC read/write access through /sys/kernel/debug/ec"
91 Say N to disable Embedded Controller /sys/kernel/debug interface
93 Be aware that using this interface can confuse your Embedded
94 Controller in a way that a normal reboot is not enough. You then
95 have to power off your system, and remove the laptop battery for
97 An Embedded Controller typically is available on laptops and reads
98 sensor values like battery state and temperature.
99 The kernel accesses the EC through ACPI parsed code provided by BIOS
100 tables. This option allows to access the EC directly without ACPI
102 Thus this option is a debug option that helps to write ACPI drivers
103 and can be used to identify ACPI code or EC firmware bugs.
105 config ACPI_PROC_EVENT
106 bool "Deprecated /proc/acpi/event support"
110 A user-space daemon, acpid, typically reads /proc/acpi/event
111 and handles all ACPI-generated events.
113 These events are now delivered to user-space either
114 via the input layer or as netlink events.
116 This build option enables the old code for legacy
117 user-space implementation. After some time, this will
118 be moved under CONFIG_ACPI_PROCFS, and then deleted.
120 Say Y here to retain the old behaviour. Say N if your
121 user-space is newer than kernel 2.6.23 (September 2007).
124 tristate "AC Adapter"
129 This driver supports the AC Adapter object, which indicates
130 whether a system is on AC or not. If you have a system that can
131 switch between A/C and battery, say Y.
133 To compile this driver as a module, choose M here:
134 the module will be called ac.
142 This driver adds support for battery information through
143 /proc/acpi/battery. If you have a mobile system with a battery,
146 To compile this driver as a module, choose M here:
147 the module will be called battery.
154 This driver handles events on the power, sleep, and lid buttons.
155 A daemon reads /proc/acpi/event and perform user-defined actions
156 such as shutting down the system. This is necessary for
157 software-controlled poweroff.
159 To compile this driver as a module, choose M here:
160 the module will be called button.
164 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
168 This driver implements the ACPI Extensions For Display Adapters
169 for integrated graphics devices on motherboard, as specified in
170 ACPI 2.0 Specification, Appendix B. This supports basic operations
171 such as defining the video POST device, retrieving EDID information,
172 and setting up a video output.
174 To compile this driver as a module, choose M here:
175 the module will be called video.
182 This driver supports ACPI fan devices, allowing user-mode
183 applications to perform basic fan control (on, off, status).
185 To compile this driver as a module, choose M here:
186 the module will be called fan.
190 depends on EXPERIMENTAL
192 This driver supports ACPI-controlled docking stations and removable
193 drive bays such as the IBM Ultrabay and the Dell Module Bay.
195 config ACPI_PROCESSOR
201 This driver installs ACPI as the idle handler for Linux and uses
202 ACPI C2 and C3 processor states to save power on systems that
203 support it. It is required by several flavors of cpufreq
204 performance-state drivers.
206 To compile this driver as a module, choose M here:
207 the module will be called processor.
210 depends on EXPERIMENTAL && IPMI_SI && IPMI_HANDLER
213 This driver enables the ACPI to access the BMC controller. And it
214 uses the IPMI request/response message to communicate with BMC
215 controller, which can be found on on the server.
217 To compile this driver as a module, choose M here:
218 the module will be called as acpi_ipmi.
220 config ACPI_HOTPLUG_CPU
222 depends on ACPI_PROCESSOR && HOTPLUG_CPU
223 select ACPI_CONTAINER
226 config ACPI_PROCESSOR_AGGREGATOR
227 tristate "Processor Aggregator"
228 depends on ACPI_PROCESSOR
229 depends on EXPERIMENTAL
232 ACPI 4.0 defines processor Aggregator, which enables OS to perform
233 specific processor configuration and control that applies to all
234 processors in the platform. Currently only logical processor idling
235 is defined, which is to reduce power consumption. This driver
236 supports the new device.
239 tristate "Thermal Zone"
240 depends on ACPI_PROCESSOR
244 This driver supports ACPI thermal zones. Most mobile and
245 some desktop systems support ACPI thermal zones. It is HIGHLY
246 recommended that this option be enabled, as your processor(s)
247 may be damaged without it.
249 To compile this driver as a module, choose M here:
250 the module will be called thermal.
255 depends on (X86 || IA64)
256 default y if IA64_GENERIC || IA64_SGI_SN2
258 config ACPI_CUSTOM_DSDT_FILE
259 string "Custom DSDT Table file to include"
261 depends on !STANDALONE
263 This option supports a custom DSDT by linking it into the kernel.
264 See Documentation/acpi/dsdt-override.txt
266 Enter the full path name to the file which includes the AmlCode
269 If unsure, don't enter a file name.
271 config ACPI_CUSTOM_DSDT
273 default ACPI_CUSTOM_DSDT_FILE != ""
275 config ACPI_BLACKLIST_YEAR
276 int "Disable ACPI for systems before Jan 1st this year" if X86_32
279 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
280 on platforms with DMI BIOS date before January 1st that year.
281 "acpi=force" can be used to override this mechanism.
283 Enter 0 to disable this mechanism and allow ACPI to
284 run by default no matter what the year. (default)
287 bool "Debug Statements"
290 The ACPI subsystem can produce debug output. Saying Y enables this
291 output and increases the kernel size by around 50K.
293 Use the acpi.debug_layer and acpi.debug_level kernel command-line
294 parameters documented in Documentation/acpi/debug.txt and
295 Documentation/kernel-parameters.txt to control the type and
296 amount of debug output.
298 config ACPI_DEBUG_FUNC_TRACE
299 bool "Additionally enable ACPI function tracing"
301 depends on ACPI_DEBUG
303 ACPI Debug Statements slow down ACPI processing. Function trace
304 is about half of the penalty and is rarely useful.
307 tristate "PCI slot detection driver"
311 This driver creates entries in /sys/bus/pci/slots/ for all PCI
312 slots in the system. This can help correlate PCI bus addresses,
313 i.e., segment/bus/device/function tuples, with physical slots in
314 the system. If you are unsure, say N.
316 To compile this driver as a module, choose M here:
317 the module will be called pci_slot.
320 bool "Power Management Timer Support" if EXPERT
324 The Power Management Timer is available on all ACPI-capable,
325 in most cases even if ACPI is unusable or blacklisted.
327 This timing source is not affected by power management features
328 like aggressive processor idling, throttling, frequency and/or
329 voltage scaling, unlike the commonly used Time Stamp Counter
332 You should nearly always say Y here because many modern
333 systems require this timer.
335 config ACPI_CONTAINER
336 tristate "Container and Module Devices (EXPERIMENTAL)"
337 depends on EXPERIMENTAL
338 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
340 This driver supports ACPI Container and Module devices (IDs
341 ACPI0004, PNP0A05, and PNP0A06).
343 This helps support hotplug of nodes, CPUs, and memory.
345 To compile this driver as a module, choose M here:
346 the module will be called container.
348 config ACPI_HOTPLUG_MEMORY
349 tristate "Memory Hotplug"
350 depends on MEMORY_HOTPLUG
353 This driver supports ACPI memory hotplug. The driver
354 fields notifications on ACPI memory devices (PNP0C80),
355 which represent memory ranges that may be onlined or
356 offlined during runtime.
358 If your hardware and firmware do not support adding or
359 removing memory devices at runtime, you need not enable
362 To compile this driver as a module, choose M here:
363 the module will be called acpi_memhotplug.
366 tristate "Smart Battery System"
370 This driver supports the Smart Battery System, another
371 type of access to battery information, found on some laptops.
373 To compile this driver as a module, choose M here:
374 the modules will be called sbs and sbshc.
377 tristate "Hardware Error Device"
379 This driver supports the Hardware Error Device (PNP0C33),
380 which is used to report some hardware errors notified via
381 SCI, mainly the corrected errors.
383 source "drivers/acpi/apei/Kconfig"