1 # SPDX-License-Identifier: GPL-2.0
7 bool "ACPI (Advanced Configuration and Power Interface) Support"
8 depends on !IA64_HP_SIM
9 depends on IA64 || X86 || ARM64
12 default y if (IA64 || X86)
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 <https://01.org/linux-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 originally co-developed by
36 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
37 it is developed by the ACPI Specification Working Group (ASWG) under
38 the UEFI Forum and any UEFI member can join the ASWG and contribute
39 to the ACPI specification.
40 The specification is available at:
41 <http://www.acpi.info>
42 <http://www.uefi.org/acpi/specs>
46 config ACPI_LEGACY_TABLES_LOOKUP
49 config ARCH_MIGHT_HAVE_ACPI_PDC
52 config ACPI_GENERIC_GSI
55 config ACPI_SYSTEM_POWER_STATES_SUPPORT
58 config ACPI_CCA_REQUIRED
62 bool "AML debugger interface"
65 Enable in-kernel debugging of AML facilities: statistics,
66 internal object dump, single step control method execution.
67 This is still under development, currently enabling this only
68 results in the compilation of the ACPICA debugger files.
72 config ACPI_DEBUGGER_USER
73 tristate "Userspace debugger accessiblity"
76 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
77 to access the debugger functionalities.
81 config ACPI_SPCR_TABLE
82 bool "ACPI Serial Port Console Redirection Support"
85 Enable support for Serial Port Console Redirection (SPCR) Table.
86 This table provides information about the configuration of the
96 depends on SUSPEND || HIBERNATION
97 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
100 config ACPI_PROCFS_POWER
101 bool "Deprecated power /proc/acpi directories"
102 depends on X86 && PROC_FS
104 For backwards compatibility, this option allows
105 deprecated power /proc/acpi/ directories to exist, even when
106 they have been replaced by functions in /sys.
107 The deprecated directories (and their replacements) include:
108 /proc/acpi/battery/* (/sys/class/power_supply/*) and
109 /proc/acpi/ac_adapter/* (sys/class/power_supply/*).
110 This option has no effect on /proc/acpi/ directories
111 and functions which do not yet exist in /sys.
112 This option, together with the proc directories, will be
113 deleted in the future.
115 Say N to delete power /proc/acpi/ directories that have moved to /sys.
117 config ACPI_REV_OVERRIDE_POSSIBLE
118 bool "Allow supported ACPI revision to be overridden"
122 The platform firmware on some systems expects Linux to return "5" as
123 the supported ACPI revision which makes it expose system configuration
124 information in a special way.
126 For example, based on what ACPI exports as the supported revision,
127 Dell XPS 13 (2015) configures its audio device to either work in HDA
128 mode or in I2S mode, where the former is supposed to be used on Linux
129 until the latter is fully supported (in the kernel as well as in user
132 This option enables a DMI-based quirk for the above Dell machine (so
133 that HDA audio is exposed by the platform firmware to the kernel) and
134 makes it possible to force the kernel to return "5" as the supported
135 ACPI revision via the "acpi_rev_override" command line switch.
137 config ACPI_EC_DEBUGFS
138 tristate "EC read/write access through /sys/kernel/debug/ec"
141 Say N to disable Embedded Controller /sys/kernel/debug interface
143 Be aware that using this interface can confuse your Embedded
144 Controller in a way that a normal reboot is not enough. You then
145 have to power off your system, and remove the laptop battery for
147 An Embedded Controller typically is available on laptops and reads
148 sensor values like battery state and temperature.
149 The kernel accesses the EC through ACPI parsed code provided by BIOS
150 tables. This option allows to access the EC directly without ACPI
152 Thus this option is a debug option that helps to write ACPI drivers
153 and can be used to identify ACPI code or EC firmware bugs.
156 tristate "AC Adapter"
161 This driver supports the AC Adapter object, which indicates
162 whether a system is on AC or not. If you have a system that can
163 switch between A/C and battery, say Y.
165 To compile this driver as a module, choose M here:
166 the module will be called ac.
174 This driver adds support for battery information through
175 /proc/acpi/battery. If you have a mobile system with a battery,
178 To compile this driver as a module, choose M here:
179 the module will be called battery.
186 This driver handles events on the power, sleep, and lid buttons.
187 A daemon reads events from input devices or via netlink and
188 performs user-defined actions such as shutting down the system.
189 This is necessary for software-controlled poweroff.
191 To compile this driver as a module, choose M here:
192 the module will be called button.
196 depends on X86 && BACKLIGHT_CLASS_DEVICE
200 This driver implements the ACPI Extensions For Display Adapters
201 for integrated graphics devices on motherboard, as specified in
202 ACPI 2.0 Specification, Appendix B. This supports basic operations
203 such as defining the video POST device, retrieving EDID information,
204 and setting up a video output.
206 To compile this driver as a module, choose M here:
207 the module will be called video.
214 This driver supports ACPI fan devices, allowing user-mode
215 applications to perform basic fan control (on, off, status).
217 To compile this driver as a module, choose M here:
218 the module will be called fan.
221 tristate "ACPI Time and Alarm (TAD) Device Support"
222 depends on SYSFS && PM_SLEEP
224 The ACPI Time and Alarm (TAD) device is an alternative to the Real
225 Time Clock (RTC). Its wake timers allow the system to transition from
226 the S3 (or optionally S4/S5) state to S0 state after a time period
227 elapses. In comparison with the RTC Alarm, the TAD provides a larger
228 scale of flexibility in the wake timers. The time capabilities of the
229 TAD maintain the time of day information across platform power
230 transitions, and keep track of time even when the platform is turned
236 This driver supports ACPI-controlled docking stations and removable
237 drive bays such as the IBM Ultrabay and the Dell Module Bay.
239 config ACPI_CPU_FREQ_PSS
243 config ACPI_PROCESSOR_CSTATE
245 depends on IA64 || X86
247 config ACPI_PROCESSOR_IDLE
256 depends on ACPI_PROCESSOR
260 If this option is enabled, this file implements common functionality
261 to parse CPPC tables as described in the ACPI 5.1+ spec. The
262 routines implemented are meant to be used by other
263 drivers to control CPU performance using CPPC semantics.
264 If your platform does not support CPPC in firmware,
265 leave this option disabled.
267 config ACPI_PROCESSOR
269 depends on X86 || IA64 || ARM64
270 select ACPI_PROCESSOR_IDLE
271 select ACPI_CPU_FREQ_PSS if X86 || IA64
274 This driver adds support for the ACPI Processor package. It is required
275 by several flavors of cpufreq performance-state, thermal, throttling and
278 To compile this driver as a module, choose M here:
279 the module will be called processor.
283 depends on IPMI_HANDLER
286 This driver enables the ACPI to access the BMC controller. And it
287 uses the IPMI request/response message to communicate with BMC
288 controller, which can be found on on the server.
290 To compile this driver as a module, choose M here:
291 the module will be called as acpi_ipmi.
293 config ACPI_HOTPLUG_CPU
295 depends on ACPI_PROCESSOR && HOTPLUG_CPU
296 select ACPI_CONTAINER
299 config ACPI_PROCESSOR_AGGREGATOR
300 tristate "Processor Aggregator"
301 depends on ACPI_PROCESSOR
304 ACPI 4.0 defines processor Aggregator, which enables OS to perform
305 specific processor configuration and control that applies to all
306 processors in the platform. Currently only logical processor idling
307 is defined, which is to reduce power consumption. This driver
308 supports the new device.
311 tristate "Thermal Zone"
312 depends on ACPI_PROCESSOR
316 This driver supports ACPI thermal zones. Most mobile and
317 some desktop systems support ACPI thermal zones. It is HIGHLY
318 recommended that this option be enabled, as your processor(s)
319 may be damaged without it.
321 To compile this driver as a module, choose M here:
322 the module will be called thermal.
327 depends on (X86 || IA64 || ARM64)
328 default y if IA64_GENERIC || IA64_SGI_SN2 || ARM64
330 config ACPI_CUSTOM_DSDT_FILE
331 string "Custom DSDT Table file to include"
333 depends on !STANDALONE
335 This option supports a custom DSDT by linking it into the kernel.
336 See Documentation/acpi/dsdt-override.txt
338 Enter the full path name to the file which includes the AmlCode
341 If unsure, don't enter a file name.
343 config ACPI_CUSTOM_DSDT
345 default ACPI_CUSTOM_DSDT_FILE != ""
347 config ARCH_HAS_ACPI_TABLE_UPGRADE
350 config ACPI_TABLE_UPGRADE
351 bool "Allow upgrading ACPI tables via initrd"
352 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
355 This option provides functionality to upgrade arbitrary ACPI tables
356 via initrd. No functional change if no ACPI tables are passed via
357 initrd, therefore it's safe to say Y.
358 See Documentation/acpi/initrd_table_override.txt for details
361 bool "Debug Statements"
364 The ACPI subsystem can produce debug output. Saying Y enables this
365 output and increases the kernel size by around 50K.
367 Use the acpi.debug_layer and acpi.debug_level kernel command-line
368 parameters documented in Documentation/acpi/debug.txt and
369 Documentation/admin-guide/kernel-parameters.rst to control the type and
370 amount of debug output.
373 bool "PCI slot detection driver"
377 This driver creates entries in /sys/bus/pci/slots/ for all PCI
378 slots in the system. This can help correlate PCI bus addresses,
379 i.e., segment/bus/device/function tuples, with physical slots in
380 the system. If you are unsure, say N.
382 config ACPI_CONTAINER
383 bool "Container and Module Devices"
384 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
386 This driver supports ACPI Container and Module devices (IDs
387 ACPI0004, PNP0A05, and PNP0A06).
389 This helps support hotplug of nodes, CPUs, and memory.
391 To compile this driver as a module, choose M here:
392 the module will be called container.
394 config ACPI_HOTPLUG_MEMORY
395 bool "Memory Hotplug"
396 depends on MEMORY_HOTPLUG
398 This driver supports ACPI memory hotplug. The driver
399 fields notifications on ACPI memory devices (PNP0C80),
400 which represent memory ranges that may be onlined or
401 offlined during runtime.
403 If your hardware and firmware do not support adding or
404 removing memory devices at runtime, you need not enable
407 To compile this driver as a module, choose M here:
408 the module will be called acpi_memhotplug.
410 config ACPI_HOTPLUG_IOAPIC
413 depends on X86_IO_APIC
417 tristate "Smart Battery System"
421 This driver supports the Smart Battery System, another
422 type of access to battery information, found on some laptops.
424 To compile this driver as a module, choose M here:
425 the modules will be called sbs and sbshc.
428 tristate "Hardware Error Device"
430 This driver supports the Hardware Error Device (PNP0C33),
431 which is used to report some hardware errors notified via
432 SCI, mainly the corrected errors.
434 config ACPI_CUSTOM_METHOD
435 tristate "Allow ACPI methods to be inserted/replaced at run time"
439 This debug facility allows ACPI AML methods to be inserted and/or
440 replaced without rebooting the system. For details refer to:
441 Documentation/acpi/method-customizing.txt.
443 NOTE: This option is security sensitive, because it allows arbitrary
444 kernel memory to be written to by root (uid=0) users, allowing them
445 to bypass certain security measures (e.g. if root is not allowed to
446 load additional kernel modules after boot, this feature may be used
447 to override that restriction).
450 bool "Boottime Graphics Resource Table support"
451 depends on EFI && (X86 || ARM64)
453 This driver adds support for exposing the ACPI Boottime Graphics
454 Resource Table, which allows the operating system to obtain
455 data from the firmware boot splash. It will appear under
456 /sys/firmware/acpi/bgrt/ .
458 config ACPI_REDUCED_HARDWARE_ONLY
459 bool "Hardware-reduced ACPI support only" if EXPERT
462 This config item changes the way the ACPI code is built. When this
463 option is selected, the kernel will use a specialized version of
464 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
465 resulting kernel will be smaller but it will also be restricted to
466 running in ACPI reduced hardware mode ONLY.
468 If you are unsure what to do, do not enable this option.
470 source "drivers/acpi/nfit/Kconfig"
472 source "drivers/acpi/apei/Kconfig"
473 source "drivers/acpi/dptf/Kconfig"
479 tristate "Extended Error Log support"
480 depends on X86_MCE && X86_LOCAL_APIC && EDAC
484 Certain usages such as Predictive Failure Analysis (PFA) require
485 more information about the error than what can be described in
486 processor machine check banks. Most server processors log
487 additional information about the error in processor uncore
488 registers. Since the addresses and layout of these registers vary
489 widely from one processor to another, system software cannot
490 readily make use of them. To complicate matters further, some of
491 the additional error information cannot be constructed without
492 detailed knowledge about platform topology.
494 Enhanced MCA Logging allows firmware to provide additional error
495 information to system software, synchronous with MCE or CMCI. This
496 driver adds support for that functionality with corresponding
497 tracepoint which carries that information to userspace.
499 menuconfig PMIC_OPREGION
500 bool "PMIC (Power Management Integrated Circuit) operation region support"
502 Select this option to enable support for ACPI operation
503 region of the PMIC chip. The operation region can be used
504 to control power rails and sensor reading/writing on the
508 config CRC_PMIC_OPREGION
509 bool "ACPI operation region support for CrystalCove PMIC"
510 depends on INTEL_SOC_PMIC
512 This config adds ACPI operation region support for CrystalCove PMIC.
514 config XPOWER_PMIC_OPREGION
515 bool "ACPI operation region support for XPower AXP288 PMIC"
516 depends on MFD_AXP20X_I2C
518 This config adds ACPI operation region support for XPower AXP288 PMIC.
520 config BXT_WC_PMIC_OPREGION
521 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
522 depends on INTEL_SOC_PMIC_BXTWC
524 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
526 config CHT_WC_PMIC_OPREGION
527 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
528 depends on INTEL_SOC_PMIC_CHTWC
530 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
532 config CHT_DC_TI_PMIC_OPREGION
533 bool "ACPI operation region support for Dollar Cove TI PMIC"
534 depends on INTEL_SOC_PMIC_CHTDC_TI
536 This config adds ACPI operation region support for Dollar Cove TI PMIC.
541 tristate "ACPI configfs support"
544 Select this option to enable support for ACPI configuration from
545 userspace. The configurable ACPI groups will be visible under
546 /config/acpi, assuming configfs is mounted under /config.
549 source "drivers/acpi/arm64/Kconfig"
555 config TPS68470_PMIC_OPREGION
556 bool "ACPI operation region support for TPS68470 PMIC"
557 depends on MFD_TPS68470
559 This config adds ACPI operation region support for TI TPS68470 PMIC.
560 TPS68470 device is an advanced power management unit that powers
561 a Compact Camera Module (CCM), generates clocks for image sensors,
562 drives a dual LED for flash and incorporates two LED drivers for
563 general purpose indicators.
564 This driver enables ACPI operation region support control voltage
565 regulators and clocks.
567 This option is a bool as it provides an ACPI operation
568 region, which must be available before any of the devices
569 using this, are probed.
574 bool "Power Management Timer Support" if EXPERT
575 depends on X86 && (ACPI || JAILHOUSE_GUEST)
578 The Power Management Timer is available on all ACPI-capable,
579 in most cases even if ACPI is unusable or blacklisted.
581 This timing source is not affected by power management features
582 like aggressive processor idling, throttling, frequency and/or
583 voltage scaling, unlike the commonly used Time Stamp Counter
586 You should nearly always say Y here because many modern
587 systems require this timer.