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
339 or dsdt_aml_code declaration.
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
360 config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD
361 bool "Override ACPI tables from built-in initrd"
362 depends on ACPI_TABLE_UPGRADE
363 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION=""
365 This option provides functionality to override arbitrary ACPI tables
366 from built-in uncompressed initrd.
368 See Documentation/acpi/initrd_table_override.txt for details
371 bool "Debug Statements"
373 The ACPI subsystem can produce debug output. Saying Y enables this
374 output and increases the kernel size by around 50K.
376 Use the acpi.debug_layer and acpi.debug_level kernel command-line
377 parameters documented in Documentation/acpi/debug.txt and
378 Documentation/admin-guide/kernel-parameters.rst to control the type and
379 amount of debug output.
382 bool "PCI slot detection driver"
383 depends on SYSFS && PCI
385 This driver creates entries in /sys/bus/pci/slots/ for all PCI
386 slots in the system. This can help correlate PCI bus addresses,
387 i.e., segment/bus/device/function tuples, with physical slots in
388 the system. If you are unsure, say N.
390 config ACPI_CONTAINER
391 bool "Container and Module Devices"
392 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
394 This driver supports ACPI Container and Module devices (IDs
395 ACPI0004, PNP0A05, and PNP0A06).
397 This helps support hotplug of nodes, CPUs, and memory.
399 To compile this driver as a module, choose M here:
400 the module will be called container.
402 config ACPI_HOTPLUG_MEMORY
403 bool "Memory Hotplug"
404 depends on MEMORY_HOTPLUG
406 This driver supports ACPI memory hotplug. The driver
407 fields notifications on ACPI memory devices (PNP0C80),
408 which represent memory ranges that may be onlined or
409 offlined during runtime.
411 If your hardware and firmware do not support adding or
412 removing memory devices at runtime, you need not enable
415 To compile this driver as a module, choose M here:
416 the module will be called acpi_memhotplug.
418 config ACPI_HOTPLUG_IOAPIC
421 depends on X86_IO_APIC
425 tristate "Smart Battery System"
429 This driver supports the Smart Battery System, another
430 type of access to battery information, found on some laptops.
432 To compile this driver as a module, choose M here:
433 the modules will be called sbs and sbshc.
436 tristate "Hardware Error Device"
438 This driver supports the Hardware Error Device (PNP0C33),
439 which is used to report some hardware errors notified via
440 SCI, mainly the corrected errors.
442 config ACPI_CUSTOM_METHOD
443 tristate "Allow ACPI methods to be inserted/replaced at run time"
446 This debug facility allows ACPI AML methods to be inserted and/or
447 replaced without rebooting the system. For details refer to:
448 Documentation/acpi/method-customizing.txt.
450 NOTE: This option is security sensitive, because it allows arbitrary
451 kernel memory to be written to by root (uid=0) users, allowing them
452 to bypass certain security measures (e.g. if root is not allowed to
453 load additional kernel modules after boot, this feature may be used
454 to override that restriction).
457 bool "Boottime Graphics Resource Table support"
458 depends on EFI && (X86 || ARM64)
460 This driver adds support for exposing the ACPI Boottime Graphics
461 Resource Table, which allows the operating system to obtain
462 data from the firmware boot splash. It will appear under
463 /sys/firmware/acpi/bgrt/ .
465 config ACPI_REDUCED_HARDWARE_ONLY
466 bool "Hardware-reduced ACPI support only" if EXPERT
469 This config item changes the way the ACPI code is built. When this
470 option is selected, the kernel will use a specialized version of
471 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
472 resulting kernel will be smaller but it will also be restricted to
473 running in ACPI reduced hardware mode ONLY.
475 If you are unsure what to do, do not enable this option.
477 source "drivers/acpi/nfit/Kconfig"
479 source "drivers/acpi/apei/Kconfig"
480 source "drivers/acpi/dptf/Kconfig"
486 tristate "Extended Error Log support"
487 depends on X86_MCE && X86_LOCAL_APIC && EDAC
490 Certain usages such as Predictive Failure Analysis (PFA) require
491 more information about the error than what can be described in
492 processor machine check banks. Most server processors log
493 additional information about the error in processor uncore
494 registers. Since the addresses and layout of these registers vary
495 widely from one processor to another, system software cannot
496 readily make use of them. To complicate matters further, some of
497 the additional error information cannot be constructed without
498 detailed knowledge about platform topology.
500 Enhanced MCA Logging allows firmware to provide additional error
501 information to system software, synchronous with MCE or CMCI. This
502 driver adds support for that functionality with corresponding
503 tracepoint which carries that information to userspace.
508 menuconfig PMIC_OPREGION
509 bool "PMIC (Power Management Integrated Circuit) operation region support"
511 Select this option to enable support for ACPI operation
512 region of the PMIC chip. The operation region can be used
513 to control power rails and sensor reading/writing on the
517 config CRC_PMIC_OPREGION
518 bool "ACPI operation region support for CrystalCove PMIC"
519 depends on INTEL_SOC_PMIC
521 This config adds ACPI operation region support for CrystalCove PMIC.
523 config XPOWER_PMIC_OPREGION
524 bool "ACPI operation region support for XPower AXP288 PMIC"
525 depends on MFD_AXP20X_I2C && IOSF_MBI=y
527 This config adds ACPI operation region support for XPower AXP288 PMIC.
529 config BXT_WC_PMIC_OPREGION
530 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
531 depends on INTEL_SOC_PMIC_BXTWC
533 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
535 config CHT_WC_PMIC_OPREGION
536 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
537 depends on INTEL_SOC_PMIC_CHTWC
539 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
541 config CHT_DC_TI_PMIC_OPREGION
542 bool "ACPI operation region support for Dollar Cove TI PMIC"
543 depends on INTEL_SOC_PMIC_CHTDC_TI
545 This config adds ACPI operation region support for Dollar Cove TI PMIC.
550 tristate "ACPI configfs support"
553 Select this option to enable support for ACPI configuration from
554 userspace. The configurable ACPI groups will be visible under
555 /config/acpi, assuming configfs is mounted under /config.
558 source "drivers/acpi/arm64/Kconfig"
564 config TPS68470_PMIC_OPREGION
565 bool "ACPI operation region support for TPS68470 PMIC"
566 depends on MFD_TPS68470
568 This config adds ACPI operation region support for TI TPS68470 PMIC.
569 TPS68470 device is an advanced power management unit that powers
570 a Compact Camera Module (CCM), generates clocks for image sensors,
571 drives a dual LED for flash and incorporates two LED drivers for
572 general purpose indicators.
573 This driver enables ACPI operation region support control voltage
574 regulators and clocks.
576 This option is a bool as it provides an ACPI operation
577 region, which must be available before any of the devices
578 using this, are probed.
583 bool "Power Management Timer Support" if EXPERT
584 depends on X86 && (ACPI || JAILHOUSE_GUEST)
587 The Power Management Timer is available on all ACPI-capable,
588 in most cases even if ACPI is unusable or blacklisted.
590 This timing source is not affected by power management features
591 like aggressive processor idling, throttling, frequency and/or
592 voltage scaling, unlike the commonly used Time Stamp Counter
595 You should nearly always say Y here because many modern
596 systems require this timer.