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/*)
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.
223 This driver supports ACPI-controlled docking stations and removable
224 drive bays such as the IBM Ultrabay and the Dell Module Bay.
226 config ACPI_CPU_FREQ_PSS
230 config ACPI_PROCESSOR_CSTATE
232 depends on IA64 || X86
234 config ACPI_PROCESSOR_IDLE
243 depends on ACPI_PROCESSOR
247 If this option is enabled, this file implements common functionality
248 to parse CPPC tables as described in the ACPI 5.1+ spec. The
249 routines implemented are meant to be used by other
250 drivers to control CPU performance using CPPC semantics.
251 If your platform does not support CPPC in firmware,
252 leave this option disabled.
254 config ACPI_PROCESSOR
256 depends on X86 || IA64 || ARM64
257 select ACPI_PROCESSOR_IDLE
258 select ACPI_CPU_FREQ_PSS if X86 || IA64
261 This driver adds support for the ACPI Processor package. It is required
262 by several flavors of cpufreq performance-state, thermal, throttling and
265 To compile this driver as a module, choose M here:
266 the module will be called processor.
270 depends on IPMI_HANDLER
273 This driver enables the ACPI to access the BMC controller. And it
274 uses the IPMI request/response message to communicate with BMC
275 controller, which can be found on on the server.
277 To compile this driver as a module, choose M here:
278 the module will be called as acpi_ipmi.
280 config ACPI_HOTPLUG_CPU
282 depends on ACPI_PROCESSOR && HOTPLUG_CPU
283 select ACPI_CONTAINER
286 config ACPI_PROCESSOR_AGGREGATOR
287 tristate "Processor Aggregator"
288 depends on ACPI_PROCESSOR
291 ACPI 4.0 defines processor Aggregator, which enables OS to perform
292 specific processor configuration and control that applies to all
293 processors in the platform. Currently only logical processor idling
294 is defined, which is to reduce power consumption. This driver
295 supports the new device.
298 tristate "Thermal Zone"
299 depends on ACPI_PROCESSOR
303 This driver supports ACPI thermal zones. Most mobile and
304 some desktop systems support ACPI thermal zones. It is HIGHLY
305 recommended that this option be enabled, as your processor(s)
306 may be damaged without it.
308 To compile this driver as a module, choose M here:
309 the module will be called thermal.
314 depends on (X86 || IA64 || ARM64)
315 default y if IA64_GENERIC || IA64_SGI_SN2 || ARM64
317 config ACPI_CUSTOM_DSDT_FILE
318 string "Custom DSDT Table file to include"
320 depends on !STANDALONE
322 This option supports a custom DSDT by linking it into the kernel.
323 See Documentation/acpi/dsdt-override.txt
325 Enter the full path name to the file which includes the AmlCode
328 If unsure, don't enter a file name.
330 config ACPI_CUSTOM_DSDT
332 default ACPI_CUSTOM_DSDT_FILE != ""
334 config ARCH_HAS_ACPI_TABLE_UPGRADE
337 config ACPI_TABLE_UPGRADE
338 bool "Allow upgrading ACPI tables via initrd"
339 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
342 This option provides functionality to upgrade arbitrary ACPI tables
343 via initrd. No functional change if no ACPI tables are passed via
344 initrd, therefore it's safe to say Y.
345 See Documentation/acpi/initrd_table_override.txt for details
348 bool "Debug Statements"
351 The ACPI subsystem can produce debug output. Saying Y enables this
352 output and increases the kernel size by around 50K.
354 Use the acpi.debug_layer and acpi.debug_level kernel command-line
355 parameters documented in Documentation/acpi/debug.txt and
356 Documentation/admin-guide/kernel-parameters.rst to control the type and
357 amount of debug output.
360 bool "PCI slot detection driver"
364 This driver creates entries in /sys/bus/pci/slots/ for all PCI
365 slots in the system. This can help correlate PCI bus addresses,
366 i.e., segment/bus/device/function tuples, with physical slots in
367 the system. If you are unsure, say N.
369 config ACPI_CONTAINER
370 bool "Container and Module Devices"
371 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
373 This driver supports ACPI Container and Module devices (IDs
374 ACPI0004, PNP0A05, and PNP0A06).
376 This helps support hotplug of nodes, CPUs, and memory.
378 To compile this driver as a module, choose M here:
379 the module will be called container.
381 config ACPI_HOTPLUG_MEMORY
382 bool "Memory Hotplug"
383 depends on MEMORY_HOTPLUG
385 This driver supports ACPI memory hotplug. The driver
386 fields notifications on ACPI memory devices (PNP0C80),
387 which represent memory ranges that may be onlined or
388 offlined during runtime.
390 If your hardware and firmware do not support adding or
391 removing memory devices at runtime, you need not enable
394 To compile this driver as a module, choose M here:
395 the module will be called acpi_memhotplug.
397 config ACPI_HOTPLUG_IOAPIC
400 depends on X86_IO_APIC
404 tristate "Smart Battery System"
408 This driver supports the Smart Battery System, another
409 type of access to battery information, found on some laptops.
411 To compile this driver as a module, choose M here:
412 the modules will be called sbs and sbshc.
415 tristate "Hardware Error Device"
417 This driver supports the Hardware Error Device (PNP0C33),
418 which is used to report some hardware errors notified via
419 SCI, mainly the corrected errors.
421 config ACPI_CUSTOM_METHOD
422 tristate "Allow ACPI methods to be inserted/replaced at run time"
426 This debug facility allows ACPI AML methods to be inserted and/or
427 replaced without rebooting the system. For details refer to:
428 Documentation/acpi/method-customizing.txt.
430 NOTE: This option is security sensitive, because it allows arbitrary
431 kernel memory to be written to by root (uid=0) users, allowing them
432 to bypass certain security measures (e.g. if root is not allowed to
433 load additional kernel modules after boot, this feature may be used
434 to override that restriction).
437 bool "Boottime Graphics Resource Table support"
438 depends on EFI && (X86 || ARM64)
440 This driver adds support for exposing the ACPI Boottime Graphics
441 Resource Table, which allows the operating system to obtain
442 data from the firmware boot splash. It will appear under
443 /sys/firmware/acpi/bgrt/ .
445 config ACPI_REDUCED_HARDWARE_ONLY
446 bool "Hardware-reduced ACPI support only" if EXPERT
449 This config item changes the way the ACPI code is built. When this
450 option is selected, the kernel will use a specialized version of
451 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
452 resulting kernel will be smaller but it will also be restricted to
453 running in ACPI reduced hardware mode ONLY.
455 If you are unsure what to do, do not enable this option.
457 source "drivers/acpi/nfit/Kconfig"
459 source "drivers/acpi/apei/Kconfig"
460 source "drivers/acpi/dptf/Kconfig"
466 tristate "Extended Error Log support"
467 depends on X86_MCE && X86_LOCAL_APIC && EDAC
471 Certain usages such as Predictive Failure Analysis (PFA) require
472 more information about the error than what can be described in
473 processor machine check banks. Most server processors log
474 additional information about the error in processor uncore
475 registers. Since the addresses and layout of these registers vary
476 widely from one processor to another, system software cannot
477 readily make use of them. To complicate matters further, some of
478 the additional error information cannot be constructed without
479 detailed knowledge about platform topology.
481 Enhanced MCA Logging allows firmware to provide additional error
482 information to system software, synchronous with MCE or CMCI. This
483 driver adds support for that functionality with corresponding
484 tracepoint which carries that information to userspace.
486 menuconfig PMIC_OPREGION
487 bool "PMIC (Power Management Integrated Circuit) operation region support"
489 Select this option to enable support for ACPI operation
490 region of the PMIC chip. The operation region can be used
491 to control power rails and sensor reading/writing on the
495 config CRC_PMIC_OPREGION
496 bool "ACPI operation region support for CrystalCove PMIC"
497 depends on INTEL_SOC_PMIC
499 This config adds ACPI operation region support for CrystalCove PMIC.
501 config XPOWER_PMIC_OPREGION
502 bool "ACPI operation region support for XPower AXP288 PMIC"
503 depends on MFD_AXP20X_I2C
505 This config adds ACPI operation region support for XPower AXP288 PMIC.
507 config BXT_WC_PMIC_OPREGION
508 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
509 depends on INTEL_SOC_PMIC_BXTWC
511 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
513 config CHT_WC_PMIC_OPREGION
514 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
515 depends on INTEL_SOC_PMIC_CHTWC
517 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
519 config CHT_DC_TI_PMIC_OPREGION
520 bool "ACPI operation region support for Dollar Cove TI PMIC"
521 depends on INTEL_SOC_PMIC_CHTDC_TI
523 This config adds ACPI operation region support for Dollar Cove TI PMIC.
528 tristate "ACPI configfs support"
531 Select this option to enable support for ACPI configuration from
532 userspace. The configurable ACPI groups will be visible under
533 /config/acpi, assuming configfs is mounted under /config.
536 source "drivers/acpi/arm64/Kconfig"
539 config TPS68470_PMIC_OPREGION
540 bool "ACPI operation region support for TPS68470 PMIC"
541 depends on MFD_TPS68470
543 This config adds ACPI operation region support for TI TPS68470 PMIC.
544 TPS68470 device is an advanced power management unit that powers
545 a Compact Camera Module (CCM), generates clocks for image sensors,
546 drives a dual LED for flash and incorporates two LED drivers for
547 general purpose indicators.
548 This driver enables ACPI operation region support control voltage
549 regulators and clocks.
551 This option is a bool as it provides an ACPI operation
552 region, which must be available before any of the devices
553 using this, are probed.
558 bool "Power Management Timer Support" if EXPERT
559 depends on X86 && (ACPI || JAILHOUSE_GUEST)
562 The Power Management Timer is available on all ACPI-capable,
563 in most cases even if ACPI is unusable or blacklisted.
565 This timing source is not affected by power management features
566 like aggressive processor idling, throttling, frequency and/or
567 voltage scaling, unlike the commonly used Time Stamp Counter
570 You should nearly always say Y here because many modern
571 systems require this timer.