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 <https://01.org/linux-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52 they have been replaced by functions in /sys.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65 they have been replaced by functions in /sys.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.
100 This driver supports the AC Adapter object, which indicates
101 whether a system is on AC or not. If you have a system that can
102 switch between A/C and battery, say Y.
104 To compile this driver as a module, choose M here:
105 the module will be called ac.
113 This driver adds support for battery information through
114 /proc/acpi/battery. If you have a mobile system with a battery,
117 To compile this driver as a module, choose M here:
118 the module will be called battery.
125 This driver handles events on the power, sleep, and lid buttons.
126 A daemon reads events from input devices or via netlink and
127 performs user-defined actions such as shutting down the system.
128 This is necessary for software-controlled poweroff.
130 To compile this driver as a module, choose M here:
131 the module will be called button.
135 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
139 This driver implements the ACPI Extensions For Display Adapters
140 for integrated graphics devices on motherboard, as specified in
141 ACPI 2.0 Specification, Appendix B. This supports basic operations
142 such as defining the video POST device, retrieving EDID information,
143 and setting up a video output.
145 To compile this driver as a module, choose M here:
146 the module will be called video.
153 This driver supports ACPI fan devices, allowing user-mode
154 applications to perform basic fan control (on, off, status).
156 To compile this driver as a module, choose M here:
157 the module will be called fan.
162 This driver supports ACPI-controlled docking stations and removable
163 drive bays such as the IBM Ultrabay and the Dell Module Bay.
165 config ACPI_PROCESSOR
171 This driver installs ACPI as the idle handler for Linux and uses
172 ACPI C2 and C3 processor states to save power on systems that
173 support it. It is required by several flavors of cpufreq
174 performance-state drivers.
176 To compile this driver as a module, choose M here:
177 the module will be called processor.
184 This driver enables the ACPI to access the BMC controller. And it
185 uses the IPMI request/response message to communicate with BMC
186 controller, which can be found on on the server.
188 To compile this driver as a module, choose M here:
189 the module will be called as acpi_ipmi.
191 config ACPI_HOTPLUG_CPU
193 depends on ACPI_PROCESSOR && HOTPLUG_CPU
194 select ACPI_CONTAINER
197 config ACPI_PROCESSOR_AGGREGATOR
198 tristate "Processor Aggregator"
199 depends on ACPI_PROCESSOR
202 ACPI 4.0 defines processor Aggregator, which enables OS to perform
203 specific processor configuration and control that applies to all
204 processors in the platform. Currently only logical processor idling
205 is defined, which is to reduce power consumption. This driver
206 supports the new device.
209 tristate "Thermal Zone"
210 depends on ACPI_PROCESSOR
214 This driver supports ACPI thermal zones. Most mobile and
215 some desktop systems support ACPI thermal zones. It is HIGHLY
216 recommended that this option be enabled, as your processor(s)
217 may be damaged without it.
219 To compile this driver as a module, choose M here:
220 the module will be called thermal.
225 depends on (X86 || IA64)
226 default y if IA64_GENERIC || IA64_SGI_SN2
228 config ACPI_CUSTOM_DSDT_FILE
229 string "Custom DSDT Table file to include"
231 depends on !STANDALONE
233 This option supports a custom DSDT by linking it into the kernel.
234 See Documentation/acpi/dsdt-override.txt
236 Enter the full path name to the file which includes the AmlCode
239 If unsure, don't enter a file name.
241 config ACPI_CUSTOM_DSDT
243 default ACPI_CUSTOM_DSDT_FILE != ""
245 config ACPI_INITRD_TABLE_OVERRIDE
246 bool "ACPI tables override via initrd"
247 depends on BLK_DEV_INITRD && X86
250 This option provides functionality to override arbitrary ACPI tables
251 via initrd. No functional change if no ACPI tables are passed via
252 initrd, therefore it's safe to say Y.
253 See Documentation/acpi/initrd_table_override.txt for details
256 bool "Debug Statements"
259 The ACPI subsystem can produce debug output. Saying Y enables this
260 output and increases the kernel size by around 50K.
262 Use the acpi.debug_layer and acpi.debug_level kernel command-line
263 parameters documented in Documentation/acpi/debug.txt and
264 Documentation/kernel-parameters.txt to control the type and
265 amount of debug output.
268 bool "PCI slot detection driver"
272 This driver creates entries in /sys/bus/pci/slots/ for all PCI
273 slots in the system. This can help correlate PCI bus addresses,
274 i.e., segment/bus/device/function tuples, with physical slots in
275 the system. If you are unsure, say N.
278 bool "Power Management Timer Support" if EXPERT
282 The Power Management Timer is available on all ACPI-capable,
283 in most cases even if ACPI is unusable or blacklisted.
285 This timing source is not affected by power management features
286 like aggressive processor idling, throttling, frequency and/or
287 voltage scaling, unlike the commonly used Time Stamp Counter
290 You should nearly always say Y here because many modern
291 systems require this timer.
293 config ACPI_CONTAINER
294 bool "Container and Module Devices"
295 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
297 This driver supports ACPI Container and Module devices (IDs
298 ACPI0004, PNP0A05, and PNP0A06).
300 This helps support hotplug of nodes, CPUs, and memory.
302 To compile this driver as a module, choose M here:
303 the module will be called container.
305 config ACPI_HOTPLUG_MEMORY
306 bool "Memory Hotplug"
307 depends on MEMORY_HOTPLUG
309 This driver supports ACPI memory hotplug. The driver
310 fields notifications on ACPI memory devices (PNP0C80),
311 which represent memory ranges that may be onlined or
312 offlined during runtime.
314 If your hardware and firmware do not support adding or
315 removing memory devices at runtime, you need not enable
318 To compile this driver as a module, choose M here:
319 the module will be called acpi_memhotplug.
322 tristate "Smart Battery System"
326 This driver supports the Smart Battery System, another
327 type of access to battery information, found on some laptops.
329 To compile this driver as a module, choose M here:
330 the modules will be called sbs and sbshc.
333 tristate "Hardware Error Device"
335 This driver supports the Hardware Error Device (PNP0C33),
336 which is used to report some hardware errors notified via
337 SCI, mainly the corrected errors.
339 config ACPI_CUSTOM_METHOD
340 tristate "Allow ACPI methods to be inserted/replaced at run time"
344 This debug facility allows ACPI AML methods to be inserted and/or
345 replaced without rebooting the system. For details refer to:
346 Documentation/acpi/method-customizing.txt.
348 NOTE: This option is security sensitive, because it allows arbitrary
349 kernel memory to be written to by root (uid=0) users, allowing them
350 to bypass certain security measures (e.g. if root is not allowed to
351 load additional kernel modules after boot, this feature may be used
352 to override that restriction).
355 bool "Boottime Graphics Resource Table support"
356 depends on EFI && X86
358 This driver adds support for exposing the ACPI Boottime Graphics
359 Resource Table, which allows the operating system to obtain
360 data from the firmware boot splash. It will appear under
361 /sys/firmware/acpi/bgrt/ .
363 source "drivers/acpi/apei/Kconfig"
366 tristate "Extended Error Log support"
367 depends on X86_MCE && X86_LOCAL_APIC
371 Certain usages such as Predictive Failure Analysis (PFA) require
372 more information about the error than what can be described in
373 processor machine check banks. Most server processors log
374 additional information about the error in processor uncore
375 registers. Since the addresses and layout of these registers vary
376 widely from one processor to another, system software cannot
377 readily make use of them. To complicate matters further, some of
378 the additional error information cannot be constructed without
379 detailed knowledge about platform topology.
381 Enhanced MCA Logging allows firmware to provide additional error
382 information to system software, synchronous with MCE or CMCI. This
383 driver adds support for that functionality.