6 bool "ACPI (Advanced Configuration and Power Interface) Support"
7 depends on !IA64_HP_SIM
8 depends on IA64 || X86 || (ARM64 && EXPERT)
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 originally co-developed by
35 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
36 it is developed by the ACPI Specification Working Group (ASWG) under
37 the UEFI Forum and any UEFI member can join the ASWG and contribute
38 to the ACPI specification.
39 The specification is available at:
40 <http://www.acpi.info>
41 <http://www.uefi.org/acpi/specs>
45 config ACPI_LEGACY_TABLES_LOOKUP
48 config ARCH_MIGHT_HAVE_ACPI_PDC
51 config ACPI_GENERIC_GSI
54 config ACPI_SYSTEM_POWER_STATES_SUPPORT
57 config ACPI_CCA_REQUIRED
61 bool "In-kernel debugger (EXPERIMENTAL)"
64 Enable in-kernel debugging facilities: statistics, internal
65 object dump, single step control method execution.
66 This is still under development, currently enabling this only
67 results in the compilation of the ACPICA debugger files.
71 depends on SUSPEND || HIBERNATION
72 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
75 config ACPI_PROCFS_POWER
76 bool "Deprecated power /proc/acpi directories"
77 depends on X86 && PROC_FS
79 For backwards compatibility, this option allows
80 deprecated power /proc/acpi/ directories to exist, even when
81 they have been replaced by functions in /sys.
82 The deprecated directories (and their replacements) include:
83 /proc/acpi/battery/* (/sys/class/power_supply/*)
84 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
85 This option has no effect on /proc/acpi/ directories
86 and functions, which do not yet exist in /sys
87 This option, together with the proc directories, will be
88 deleted in the future.
90 Say N to delete power /proc/acpi/ directories that have moved to /sys/
92 config ACPI_REV_OVERRIDE_POSSIBLE
93 bool "Allow supported ACPI revision to be overriden"
97 The platform firmware on some systems expects Linux to return "5" as
98 the supported ACPI revision which makes it expose system configuration
99 information in a special way.
101 For example, based on what ACPI exports as the supported revision,
102 Dell XPS 13 (2015) configures its audio device to either work in HDA
103 mode or in I2S mode, where the former is supposed to be used on Linux
104 until the latter is fully supported (in the kernel as well as in user
107 This option enables a DMI-based quirk for the above Dell machine (so
108 that HDA audio is exposed by the platform firmware to the kernel) and
109 makes it possible to force the kernel to return "5" as the supported
110 ACPI revision via the "acpi_rev_override" command line switch.
112 config ACPI_EC_DEBUGFS
113 tristate "EC read/write access through /sys/kernel/debug/ec"
116 Say N to disable Embedded Controller /sys/kernel/debug interface
118 Be aware that using this interface can confuse your Embedded
119 Controller in a way that a normal reboot is not enough. You then
120 have to power off your system, and remove the laptop battery for
122 An Embedded Controller typically is available on laptops and reads
123 sensor values like battery state and temperature.
124 The kernel accesses the EC through ACPI parsed code provided by BIOS
125 tables. This option allows to access the EC directly without ACPI
127 Thus this option is a debug option that helps to write ACPI drivers
128 and can be used to identify ACPI code or EC firmware bugs.
131 tristate "AC Adapter"
136 This driver supports the AC Adapter object, which indicates
137 whether a system is on AC or not. If you have a system that can
138 switch between A/C and battery, say Y.
140 To compile this driver as a module, choose M here:
141 the module will be called ac.
149 This driver adds support for battery information through
150 /proc/acpi/battery. If you have a mobile system with a battery,
153 To compile this driver as a module, choose M here:
154 the module will be called battery.
161 This driver handles events on the power, sleep, and lid buttons.
162 A daemon reads events from input devices or via netlink and
163 performs user-defined actions such as shutting down the system.
164 This is necessary for software-controlled poweroff.
166 To compile this driver as a module, choose M here:
167 the module will be called button.
171 depends on X86 && BACKLIGHT_CLASS_DEVICE
175 This driver implements the ACPI Extensions For Display Adapters
176 for integrated graphics devices on motherboard, as specified in
177 ACPI 2.0 Specification, Appendix B. This supports basic operations
178 such as defining the video POST device, retrieving EDID information,
179 and setting up a video output.
181 To compile this driver as a module, choose M here:
182 the module will be called video.
189 This driver supports ACPI fan devices, allowing user-mode
190 applications to perform basic fan control (on, off, status).
192 To compile this driver as a module, choose M here:
193 the module will be called fan.
198 This driver supports ACPI-controlled docking stations and removable
199 drive bays such as the IBM Ultrabay and the Dell Module Bay.
201 config ACPI_CPU_FREQ_PSS
205 config ACPI_PROCESSOR_IDLE
211 depends on ACPI_PROCESSOR
212 depends on !ACPI_CPU_FREQ_PSS
216 If this option is enabled, this file implements common functionality
217 to parse CPPC tables as described in the ACPI 5.1+ spec. The
218 routines implemented are meant to be used by other
219 drivers to control CPU performance using CPPC semantics.
220 If your platform does not support CPPC in firmware,
221 leave this option disabled.
223 config ACPI_PROCESSOR
225 depends on X86 || IA64 || ARM64
226 select ACPI_PROCESSOR_IDLE if X86 || IA64
227 select ACPI_CPU_FREQ_PSS if X86 || IA64
230 This driver adds support for the ACPI Processor package. It is required
231 by several flavors of cpufreq performance-state, thermal, throttling and
234 To compile this driver as a module, choose M here:
235 the module will be called processor.
242 This driver enables the ACPI to access the BMC controller. And it
243 uses the IPMI request/response message to communicate with BMC
244 controller, which can be found on on the server.
246 To compile this driver as a module, choose M here:
247 the module will be called as acpi_ipmi.
249 config ACPI_HOTPLUG_CPU
251 depends on ACPI_PROCESSOR && HOTPLUG_CPU
252 select ACPI_CONTAINER
255 config ACPI_PROCESSOR_AGGREGATOR
256 tristate "Processor Aggregator"
257 depends on ACPI_PROCESSOR
260 ACPI 4.0 defines processor Aggregator, which enables OS to perform
261 specific processor configuration and control that applies to all
262 processors in the platform. Currently only logical processor idling
263 is defined, which is to reduce power consumption. This driver
264 supports the new device.
267 tristate "Thermal Zone"
268 depends on ACPI_PROCESSOR
272 This driver supports ACPI thermal zones. Most mobile and
273 some desktop systems support ACPI thermal zones. It is HIGHLY
274 recommended that this option be enabled, as your processor(s)
275 may be damaged without it.
277 To compile this driver as a module, choose M here:
278 the module will be called thermal.
283 depends on (X86 || IA64)
284 default y if IA64_GENERIC || IA64_SGI_SN2
286 config ACPI_CUSTOM_DSDT_FILE
287 string "Custom DSDT Table file to include"
289 depends on !STANDALONE
291 This option supports a custom DSDT by linking it into the kernel.
292 See Documentation/acpi/dsdt-override.txt
294 Enter the full path name to the file which includes the AmlCode
297 If unsure, don't enter a file name.
299 config ACPI_CUSTOM_DSDT
301 default ACPI_CUSTOM_DSDT_FILE != ""
303 config ACPI_INITRD_TABLE_OVERRIDE
304 bool "ACPI tables override via initrd"
305 depends on BLK_DEV_INITRD && X86
308 This option provides functionality to override arbitrary ACPI tables
309 via initrd. No functional change if no ACPI tables are passed via
310 initrd, therefore it's safe to say Y.
311 See Documentation/acpi/initrd_table_override.txt for details
314 bool "Debug Statements"
317 The ACPI subsystem can produce debug output. Saying Y enables this
318 output and increases the kernel size by around 50K.
320 Use the acpi.debug_layer and acpi.debug_level kernel command-line
321 parameters documented in Documentation/acpi/debug.txt and
322 Documentation/kernel-parameters.txt to control the type and
323 amount of debug output.
326 bool "PCI slot detection driver"
330 This driver creates entries in /sys/bus/pci/slots/ for all PCI
331 slots in the system. This can help correlate PCI bus addresses,
332 i.e., segment/bus/device/function tuples, with physical slots in
333 the system. If you are unsure, say N.
336 bool "Power Management Timer Support" if EXPERT
340 The Power Management Timer is available on all ACPI-capable,
341 in most cases even if ACPI is unusable or blacklisted.
343 This timing source is not affected by power management features
344 like aggressive processor idling, throttling, frequency and/or
345 voltage scaling, unlike the commonly used Time Stamp Counter
348 You should nearly always say Y here because many modern
349 systems require this timer.
351 config ACPI_CONTAINER
352 bool "Container and Module Devices"
353 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
355 This driver supports ACPI Container and Module devices (IDs
356 ACPI0004, PNP0A05, and PNP0A06).
358 This helps support hotplug of nodes, CPUs, and memory.
360 To compile this driver as a module, choose M here:
361 the module will be called container.
363 config ACPI_HOTPLUG_MEMORY
364 bool "Memory Hotplug"
365 depends on MEMORY_HOTPLUG
367 This driver supports ACPI memory hotplug. The driver
368 fields notifications on ACPI memory devices (PNP0C80),
369 which represent memory ranges that may be onlined or
370 offlined during runtime.
372 If your hardware and firmware do not support adding or
373 removing memory devices at runtime, you need not enable
376 To compile this driver as a module, choose M here:
377 the module will be called acpi_memhotplug.
379 config ACPI_HOTPLUG_IOAPIC
382 depends on X86_IO_APIC
386 tristate "Smart Battery System"
390 This driver supports the Smart Battery System, another
391 type of access to battery information, found on some laptops.
393 To compile this driver as a module, choose M here:
394 the modules will be called sbs and sbshc.
397 tristate "Hardware Error Device"
399 This driver supports the Hardware Error Device (PNP0C33),
400 which is used to report some hardware errors notified via
401 SCI, mainly the corrected errors.
403 config ACPI_CUSTOM_METHOD
404 tristate "Allow ACPI methods to be inserted/replaced at run time"
408 This debug facility allows ACPI AML methods to be inserted and/or
409 replaced without rebooting the system. For details refer to:
410 Documentation/acpi/method-customizing.txt.
412 NOTE: This option is security sensitive, because it allows arbitrary
413 kernel memory to be written to by root (uid=0) users, allowing them
414 to bypass certain security measures (e.g. if root is not allowed to
415 load additional kernel modules after boot, this feature may be used
416 to override that restriction).
419 bool "Boottime Graphics Resource Table support"
420 depends on EFI && X86
422 This driver adds support for exposing the ACPI Boottime Graphics
423 Resource Table, which allows the operating system to obtain
424 data from the firmware boot splash. It will appear under
425 /sys/firmware/acpi/bgrt/ .
427 config ACPI_REDUCED_HARDWARE_ONLY
428 bool "Hardware-reduced ACPI support only" if EXPERT
431 This config item changes the way the ACPI code is built. When this
432 option is selected, the kernel will use a specialized version of
433 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
434 resulting kernel will be smaller but it will also be restricted to
435 running in ACPI reduced hardware mode ONLY.
437 If you are unsure what to do, do not enable this option.
440 tristate "ACPI NVDIMM Firmware Interface Table (NFIT)"
441 depends on PHYS_ADDR_T_64BIT
443 depends on ARCH_HAS_MMIO_FLUSH
446 Infrastructure to probe ACPI 6 compliant platforms for
447 NVDIMMs (NFIT) and register a libnvdimm device tree. In
448 addition to storage devices this also enables libnvdimm to pass
449 ACPI._DSM messages for platform/dimm configuration.
451 To compile this driver as a module, choose M here:
452 the module will be called nfit.
454 config ACPI_NFIT_DEBUG
455 bool "NFIT DSM debug"
457 depends on DYNAMIC_DEBUG
460 Enabling this option causes the nfit driver to dump the
461 input and output buffers of _DSM operations on the ACPI0012
462 device and its children. This can be very verbose, so leave
463 it disabled unless you are debugging a hardware / firmware
466 source "drivers/acpi/apei/Kconfig"
469 tristate "Extended Error Log support"
470 depends on X86_MCE && X86_LOCAL_APIC
475 Certain usages such as Predictive Failure Analysis (PFA) require
476 more information about the error than what can be described in
477 processor machine check banks. Most server processors log
478 additional information about the error in processor uncore
479 registers. Since the addresses and layout of these registers vary
480 widely from one processor to another, system software cannot
481 readily make use of them. To complicate matters further, some of
482 the additional error information cannot be constructed without
483 detailed knowledge about platform topology.
485 Enhanced MCA Logging allows firmware to provide additional error
486 information to system software, synchronous with MCE or CMCI. This
487 driver adds support for that functionality with corresponding
488 tracepoint which carries that information to userspace.
490 menuconfig PMIC_OPREGION
491 bool "PMIC (Power Management Integrated Circuit) operation region support"
493 Select this option to enable support for ACPI operation
494 region of the PMIC chip. The operation region can be used
495 to control power rails and sensor reading/writing on the
499 config CRC_PMIC_OPREGION
500 bool "ACPI operation region support for CrystalCove PMIC"
501 depends on INTEL_SOC_PMIC
503 This config adds ACPI operation region support for CrystalCove PMIC.
505 config XPOWER_PMIC_OPREGION
506 bool "ACPI operation region support for XPower AXP288 PMIC"
507 depends on AXP288_ADC = y
509 This config adds ACPI operation region support for XPower AXP288 PMIC.