1 # SPDX-License-Identifier: GPL-2.0
6 config ARCH_SUPPORTS_ACPI
10 bool "ACPI (Advanced Configuration and Power Interface) Support"
11 depends on ARCH_SUPPORTS_ACPI
16 Advanced Configuration and Power Interface (ACPI) support for
17 Linux requires an ACPI-compliant platform (hardware/firmware),
18 and assumes the presence of OS-directed configuration and power
19 management (OSPM) software. This option will enlarge your
22 Linux ACPI provides a robust functional replacement for several
23 legacy configuration and power management interfaces, including
24 the Plug-and-Play BIOS specification (PnP BIOS), the
25 MultiProcessor Specification (MPS), and the Advanced Power
26 Management (APM) specification. If both ACPI and APM support
27 are configured, ACPI is used.
29 The project home page for the Linux ACPI subsystem is here:
30 <https://01.org/linux-acpi>
32 Linux support for ACPI is based on Intel Corporation's ACPI
33 Component Architecture (ACPI CA). For more information on the
37 ACPI is an open industry specification originally co-developed by
38 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
39 it is developed by the ACPI Specification Working Group (ASWG) under
40 the UEFI Forum and any UEFI member can join the ASWG and contribute
41 to the ACPI specification.
42 The specification is available at:
43 <http://www.acpi.info>
44 <http://www.uefi.org/acpi/specs>
48 config ACPI_LEGACY_TABLES_LOOKUP
51 config ARCH_MIGHT_HAVE_ACPI_PDC
54 config ACPI_GENERIC_GSI
57 config ACPI_SYSTEM_POWER_STATES_SUPPORT
60 config ACPI_CCA_REQUIRED
64 bool "AML debugger interface"
67 Enable in-kernel debugging of AML facilities: statistics,
68 internal object dump, single step control method execution.
69 This is still under development, currently enabling this only
70 results in the compilation of the ACPICA debugger files.
74 config ACPI_DEBUGGER_USER
75 tristate "Userspace debugger accessiblity"
78 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
79 to access the debugger functionalities.
83 config ACPI_SPCR_TABLE
84 bool "ACPI Serial Port Console Redirection Support"
87 Enable support for Serial Port Console Redirection (SPCR) Table.
88 This table provides information about the configuration of the
98 depends on SUSPEND || HIBERNATION
99 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
102 config ACPI_PROCFS_POWER
103 bool "Deprecated power /proc/acpi directories"
104 depends on X86 && PROC_FS
106 For backwards compatibility, this option allows
107 deprecated power /proc/acpi/ directories to exist, even when
108 they have been replaced by functions in /sys.
109 The deprecated directories (and their replacements) include:
110 /proc/acpi/battery/* (/sys/class/power_supply/*) and
111 /proc/acpi/ac_adapter/* (sys/class/power_supply/*).
112 This option has no effect on /proc/acpi/ directories
113 and functions which do not yet exist in /sys.
114 This option, together with the proc directories, will be
115 deleted in the future.
117 Say N to delete power /proc/acpi/ directories that have moved to /sys.
119 config ACPI_REV_OVERRIDE_POSSIBLE
120 bool "Allow supported ACPI revision to be overridden"
124 The platform firmware on some systems expects Linux to return "5" as
125 the supported ACPI revision which makes it expose system configuration
126 information in a special way.
128 For example, based on what ACPI exports as the supported revision,
129 Dell XPS 13 (2015) configures its audio device to either work in HDA
130 mode or in I2S mode, where the former is supposed to be used on Linux
131 until the latter is fully supported (in the kernel as well as in user
134 This option enables a DMI-based quirk for the above Dell machine (so
135 that HDA audio is exposed by the platform firmware to the kernel) and
136 makes it possible to force the kernel to return "5" as the supported
137 ACPI revision via the "acpi_rev_override" command line switch.
139 config ACPI_EC_DEBUGFS
140 tristate "EC read/write access through /sys/kernel/debug/ec"
142 Say N to disable Embedded Controller /sys/kernel/debug interface
144 Be aware that using this interface can confuse your Embedded
145 Controller in a way that a normal reboot is not enough. You then
146 have to power off your system, and remove the laptop battery for
148 An Embedded Controller typically is available on laptops and reads
149 sensor values like battery state and temperature.
150 The kernel accesses the EC through ACPI parsed code provided by BIOS
151 tables. This option allows to access the EC directly without ACPI
153 Thus this option is a debug option that helps to write ACPI drivers
154 and can be used to identify ACPI code or EC firmware bugs.
157 tristate "AC Adapter"
162 This driver supports the AC Adapter object, which indicates
163 whether a system is on AC or not. If you have a system that can
164 switch between A/C and battery, say Y.
166 To compile this driver as a module, choose M here:
167 the module will be called ac.
175 This driver adds support for battery information through
176 /proc/acpi/battery. If you have a mobile system with a battery,
179 To compile this driver as a module, choose M here:
180 the module will be called battery.
187 This driver handles events on the power, sleep, and lid buttons.
188 A daemon reads events from input devices or via netlink and
189 performs user-defined actions such as shutting down the system.
190 This is necessary for software-controlled poweroff.
192 To compile this driver as a module, choose M here:
193 the module will be called button.
197 depends on X86 && BACKLIGHT_CLASS_DEVICE
201 This driver implements the ACPI Extensions For Display Adapters
202 for integrated graphics devices on motherboard, as specified in
203 ACPI 2.0 Specification, Appendix B. This supports basic operations
204 such as defining the video POST device, retrieving EDID information,
205 and setting up a video output.
207 To compile this driver as a module, choose M here:
208 the module will be called video.
215 This driver supports ACPI fan devices, allowing user-mode
216 applications to perform basic fan control (on, off, status).
218 To compile this driver as a module, choose M here:
219 the module will be called fan.
222 tristate "ACPI Time and Alarm (TAD) Device Support"
223 depends on SYSFS && PM_SLEEP
225 The ACPI Time and Alarm (TAD) device is an alternative to the Real
226 Time Clock (RTC). Its wake timers allow the system to transition from
227 the S3 (or optionally S4/S5) state to S0 state after a time period
228 elapses. In comparison with the RTC Alarm, the TAD provides a larger
229 scale of flexibility in the wake timers. The time capabilities of the
230 TAD maintain the time of day information across platform power
231 transitions, and keep track of time even when the platform is turned
237 This driver supports ACPI-controlled docking stations and removable
238 drive bays such as the IBM Ultrabay and the Dell Module Bay.
240 config ACPI_CPU_FREQ_PSS
244 config ACPI_PROCESSOR_CSTATE
246 depends on IA64 || X86
248 config ACPI_PROCESSOR_IDLE
257 depends on ACPI_PROCESSOR
261 If this option is enabled, this file implements common functionality
262 to parse CPPC tables as described in the ACPI 5.1+ spec. The
263 routines implemented are meant to be used by other
264 drivers to control CPU performance using CPPC semantics.
265 If your platform does not support CPPC in firmware,
266 leave this option disabled.
268 config ACPI_PROCESSOR
270 depends on X86 || IA64 || ARM64
271 select ACPI_PROCESSOR_IDLE
272 select ACPI_CPU_FREQ_PSS if X86 || IA64
275 This driver adds support for the ACPI Processor package. It is required
276 by several flavors of cpufreq performance-state, thermal, throttling and
279 To compile this driver as a module, choose M here:
280 the module will be called processor.
284 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"
363 The ACPI subsystem can produce debug output. Saying Y enables this
364 output and increases the kernel size by around 50K.
366 Use the acpi.debug_layer and acpi.debug_level kernel command-line
367 parameters documented in Documentation/acpi/debug.txt and
368 Documentation/admin-guide/kernel-parameters.rst to control the type and
369 amount of debug output.
372 bool "PCI slot detection driver"
375 This driver creates entries in /sys/bus/pci/slots/ for all PCI
376 slots in the system. This can help correlate PCI bus addresses,
377 i.e., segment/bus/device/function tuples, with physical slots in
378 the system. If you are unsure, say N.
380 config ACPI_CONTAINER
381 bool "Container and Module Devices"
382 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
384 This driver supports ACPI Container and Module devices (IDs
385 ACPI0004, PNP0A05, and PNP0A06).
387 This helps support hotplug of nodes, CPUs, and memory.
389 To compile this driver as a module, choose M here:
390 the module will be called container.
392 config ACPI_HOTPLUG_MEMORY
393 bool "Memory Hotplug"
394 depends on MEMORY_HOTPLUG
396 This driver supports ACPI memory hotplug. The driver
397 fields notifications on ACPI memory devices (PNP0C80),
398 which represent memory ranges that may be onlined or
399 offlined during runtime.
401 If your hardware and firmware do not support adding or
402 removing memory devices at runtime, you need not enable
405 To compile this driver as a module, choose M here:
406 the module will be called acpi_memhotplug.
408 config ACPI_HOTPLUG_IOAPIC
411 depends on X86_IO_APIC
415 tristate "Smart Battery System"
419 This driver supports the Smart Battery System, another
420 type of access to battery information, found on some laptops.
422 To compile this driver as a module, choose M here:
423 the modules will be called sbs and sbshc.
426 tristate "Hardware Error Device"
428 This driver supports the Hardware Error Device (PNP0C33),
429 which is used to report some hardware errors notified via
430 SCI, mainly the corrected errors.
432 config ACPI_CUSTOM_METHOD
433 tristate "Allow ACPI methods to be inserted/replaced at run time"
436 This debug facility allows ACPI AML methods to be inserted and/or
437 replaced without rebooting the system. For details refer to:
438 Documentation/acpi/method-customizing.txt.
440 NOTE: This option is security sensitive, because it allows arbitrary
441 kernel memory to be written to by root (uid=0) users, allowing them
442 to bypass certain security measures (e.g. if root is not allowed to
443 load additional kernel modules after boot, this feature may be used
444 to override that restriction).
447 bool "Boottime Graphics Resource Table support"
448 depends on EFI && (X86 || ARM64)
450 This driver adds support for exposing the ACPI Boottime Graphics
451 Resource Table, which allows the operating system to obtain
452 data from the firmware boot splash. It will appear under
453 /sys/firmware/acpi/bgrt/ .
455 config ACPI_REDUCED_HARDWARE_ONLY
456 bool "Hardware-reduced ACPI support only" if EXPERT
459 This config item changes the way the ACPI code is built. When this
460 option is selected, the kernel will use a specialized version of
461 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
462 resulting kernel will be smaller but it will also be restricted to
463 running in ACPI reduced hardware mode ONLY.
465 If you are unsure what to do, do not enable this option.
467 source "drivers/acpi/nfit/Kconfig"
469 source "drivers/acpi/apei/Kconfig"
470 source "drivers/acpi/dptf/Kconfig"
476 tristate "Extended Error Log support"
477 depends on X86_MCE && X86_LOCAL_APIC && EDAC
480 Certain usages such as Predictive Failure Analysis (PFA) require
481 more information about the error than what can be described in
482 processor machine check banks. Most server processors log
483 additional information about the error in processor uncore
484 registers. Since the addresses and layout of these registers vary
485 widely from one processor to another, system software cannot
486 readily make use of them. To complicate matters further, some of
487 the additional error information cannot be constructed without
488 detailed knowledge about platform topology.
490 Enhanced MCA Logging allows firmware to provide additional error
491 information to system software, synchronous with MCE or CMCI. This
492 driver adds support for that functionality with corresponding
493 tracepoint which carries that information to userspace.
498 menuconfig PMIC_OPREGION
499 bool "PMIC (Power Management Integrated Circuit) operation region support"
501 Select this option to enable support for ACPI operation
502 region of the PMIC chip. The operation region can be used
503 to control power rails and sensor reading/writing on the
507 config CRC_PMIC_OPREGION
508 bool "ACPI operation region support for CrystalCove PMIC"
509 depends on INTEL_SOC_PMIC
511 This config adds ACPI operation region support for CrystalCove PMIC.
513 config XPOWER_PMIC_OPREGION
514 bool "ACPI operation region support for XPower AXP288 PMIC"
515 depends on MFD_AXP20X_I2C && IOSF_MBI
517 This config adds ACPI operation region support for XPower AXP288 PMIC.
519 config BXT_WC_PMIC_OPREGION
520 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
521 depends on INTEL_SOC_PMIC_BXTWC
523 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
525 config CHT_WC_PMIC_OPREGION
526 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
527 depends on INTEL_SOC_PMIC_CHTWC
529 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
531 config CHT_DC_TI_PMIC_OPREGION
532 bool "ACPI operation region support for Dollar Cove TI PMIC"
533 depends on INTEL_SOC_PMIC_CHTDC_TI
535 This config adds ACPI operation region support for Dollar Cove TI PMIC.
540 tristate "ACPI configfs support"
543 Select this option to enable support for ACPI configuration from
544 userspace. The configurable ACPI groups will be visible under
545 /config/acpi, assuming configfs is mounted under /config.
548 source "drivers/acpi/arm64/Kconfig"
554 config TPS68470_PMIC_OPREGION
555 bool "ACPI operation region support for TPS68470 PMIC"
556 depends on MFD_TPS68470
558 This config adds ACPI operation region support for TI TPS68470 PMIC.
559 TPS68470 device is an advanced power management unit that powers
560 a Compact Camera Module (CCM), generates clocks for image sensors,
561 drives a dual LED for flash and incorporates two LED drivers for
562 general purpose indicators.
563 This driver enables ACPI operation region support control voltage
564 regulators and clocks.
566 This option is a bool as it provides an ACPI operation
567 region, which must be available before any of the devices
568 using this, are probed.
573 bool "Power Management Timer Support" if EXPERT
574 depends on X86 && (ACPI || JAILHOUSE_GUEST)
577 The Power Management Timer is available on all ACPI-capable,
578 in most cases even if ACPI is unusable or blacklisted.
580 This timing source is not affected by power management features
581 like aggressive processor idling, throttling, frequency and/or
582 voltage scaling, unlike the commonly used Time Stamp Counter
585 You should nearly always say Y here because many modern
586 systems require this timer.