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"
143 Say N to disable Embedded Controller /sys/kernel/debug interface
145 Be aware that using this interface can confuse your Embedded
146 Controller in a way that a normal reboot is not enough. You then
147 have to power off your system, and remove the laptop battery for
149 An Embedded Controller typically is available on laptops and reads
150 sensor values like battery state and temperature.
151 The kernel accesses the EC through ACPI parsed code provided by BIOS
152 tables. This option allows to access the EC directly without ACPI
154 Thus this option is a debug option that helps to write ACPI drivers
155 and can be used to identify ACPI code or EC firmware bugs.
158 tristate "AC Adapter"
163 This driver supports the AC Adapter object, which indicates
164 whether a system is on AC or not. If you have a system that can
165 switch between A/C and battery, say Y.
167 To compile this driver as a module, choose M here:
168 the module will be called ac.
176 This driver adds support for battery information through
177 /proc/acpi/battery. If you have a mobile system with a battery,
180 To compile this driver as a module, choose M here:
181 the module will be called battery.
188 This driver handles events on the power, sleep, and lid buttons.
189 A daemon reads events from input devices or via netlink and
190 performs user-defined actions such as shutting down the system.
191 This is necessary for software-controlled poweroff.
193 To compile this driver as a module, choose M here:
194 the module will be called button.
198 depends on X86 && BACKLIGHT_CLASS_DEVICE
202 This driver implements the ACPI Extensions For Display Adapters
203 for integrated graphics devices on motherboard, as specified in
204 ACPI 2.0 Specification, Appendix B. This supports basic operations
205 such as defining the video POST device, retrieving EDID information,
206 and setting up a video output.
208 To compile this driver as a module, choose M here:
209 the module will be called video.
216 This driver supports ACPI fan devices, allowing user-mode
217 applications to perform basic fan control (on, off, status).
219 To compile this driver as a module, choose M here:
220 the module will be called fan.
223 tristate "ACPI Time and Alarm (TAD) Device Support"
224 depends on SYSFS && PM_SLEEP
226 The ACPI Time and Alarm (TAD) device is an alternative to the Real
227 Time Clock (RTC). Its wake timers allow the system to transition from
228 the S3 (or optionally S4/S5) state to S0 state after a time period
229 elapses. In comparison with the RTC Alarm, the TAD provides a larger
230 scale of flexibility in the wake timers. The time capabilities of the
231 TAD maintain the time of day information across platform power
232 transitions, and keep track of time even when the platform is turned
238 This driver supports ACPI-controlled docking stations and removable
239 drive bays such as the IBM Ultrabay and the Dell Module Bay.
241 config ACPI_CPU_FREQ_PSS
245 config ACPI_PROCESSOR_CSTATE
247 depends on IA64 || X86
249 config ACPI_PROCESSOR_IDLE
258 depends on ACPI_PROCESSOR
262 If this option is enabled, this file implements common functionality
263 to parse CPPC tables as described in the ACPI 5.1+ spec. The
264 routines implemented are meant to be used by other
265 drivers to control CPU performance using CPPC semantics.
266 If your platform does not support CPPC in firmware,
267 leave this option disabled.
269 config ACPI_PROCESSOR
271 depends on X86 || IA64 || ARM64
272 select ACPI_PROCESSOR_IDLE
273 select ACPI_CPU_FREQ_PSS if X86 || IA64
276 This driver adds support for the ACPI Processor package. It is required
277 by several flavors of cpufreq performance-state, thermal, throttling and
280 To compile this driver as a module, choose M here:
281 the module will be called processor.
285 depends on IPMI_HANDLER
288 This driver enables the ACPI to access the BMC controller. And it
289 uses the IPMI request/response message to communicate with BMC
290 controller, which can be found on on the server.
292 To compile this driver as a module, choose M here:
293 the module will be called as acpi_ipmi.
295 config ACPI_HOTPLUG_CPU
297 depends on ACPI_PROCESSOR && HOTPLUG_CPU
298 select ACPI_CONTAINER
301 config ACPI_PROCESSOR_AGGREGATOR
302 tristate "Processor Aggregator"
303 depends on ACPI_PROCESSOR
306 ACPI 4.0 defines processor Aggregator, which enables OS to perform
307 specific processor configuration and control that applies to all
308 processors in the platform. Currently only logical processor idling
309 is defined, which is to reduce power consumption. This driver
310 supports the new device.
313 tristate "Thermal Zone"
314 depends on ACPI_PROCESSOR
318 This driver supports ACPI thermal zones. Most mobile and
319 some desktop systems support ACPI thermal zones. It is HIGHLY
320 recommended that this option be enabled, as your processor(s)
321 may be damaged without it.
323 To compile this driver as a module, choose M here:
324 the module will be called thermal.
329 depends on (X86 || IA64 || ARM64)
330 default y if IA64_GENERIC || IA64_SGI_SN2 || ARM64
332 config ACPI_CUSTOM_DSDT_FILE
333 string "Custom DSDT Table file to include"
335 depends on !STANDALONE
337 This option supports a custom DSDT by linking it into the kernel.
338 See Documentation/acpi/dsdt-override.txt
340 Enter the full path name to the file which includes the AmlCode
343 If unsure, don't enter a file name.
345 config ACPI_CUSTOM_DSDT
347 default ACPI_CUSTOM_DSDT_FILE != ""
349 config ARCH_HAS_ACPI_TABLE_UPGRADE
352 config ACPI_TABLE_UPGRADE
353 bool "Allow upgrading ACPI tables via initrd"
354 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
357 This option provides functionality to upgrade arbitrary ACPI tables
358 via initrd. No functional change if no ACPI tables are passed via
359 initrd, therefore it's safe to say Y.
360 See Documentation/acpi/initrd_table_override.txt for details
363 bool "Debug Statements"
366 The ACPI subsystem can produce debug output. Saying Y enables this
367 output and increases the kernel size by around 50K.
369 Use the acpi.debug_layer and acpi.debug_level kernel command-line
370 parameters documented in Documentation/acpi/debug.txt and
371 Documentation/admin-guide/kernel-parameters.rst to control the type and
372 amount of debug output.
375 bool "PCI slot detection driver"
379 This driver creates entries in /sys/bus/pci/slots/ for all PCI
380 slots in the system. This can help correlate PCI bus addresses,
381 i.e., segment/bus/device/function tuples, with physical slots in
382 the system. If you are unsure, say N.
384 config ACPI_CONTAINER
385 bool "Container and Module Devices"
386 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
388 This driver supports ACPI Container and Module devices (IDs
389 ACPI0004, PNP0A05, and PNP0A06).
391 This helps support hotplug of nodes, CPUs, and memory.
393 To compile this driver as a module, choose M here:
394 the module will be called container.
396 config ACPI_HOTPLUG_MEMORY
397 bool "Memory Hotplug"
398 depends on MEMORY_HOTPLUG
400 This driver supports ACPI memory hotplug. The driver
401 fields notifications on ACPI memory devices (PNP0C80),
402 which represent memory ranges that may be onlined or
403 offlined during runtime.
405 If your hardware and firmware do not support adding or
406 removing memory devices at runtime, you need not enable
409 To compile this driver as a module, choose M here:
410 the module will be called acpi_memhotplug.
412 config ACPI_HOTPLUG_IOAPIC
415 depends on X86_IO_APIC
419 tristate "Smart Battery System"
423 This driver supports the Smart Battery System, another
424 type of access to battery information, found on some laptops.
426 To compile this driver as a module, choose M here:
427 the modules will be called sbs and sbshc.
430 tristate "Hardware Error Device"
432 This driver supports the Hardware Error Device (PNP0C33),
433 which is used to report some hardware errors notified via
434 SCI, mainly the corrected errors.
436 config ACPI_CUSTOM_METHOD
437 tristate "Allow ACPI methods to be inserted/replaced at run time"
441 This debug facility allows ACPI AML methods to be inserted and/or
442 replaced without rebooting the system. For details refer to:
443 Documentation/acpi/method-customizing.txt.
445 NOTE: This option is security sensitive, because it allows arbitrary
446 kernel memory to be written to by root (uid=0) users, allowing them
447 to bypass certain security measures (e.g. if root is not allowed to
448 load additional kernel modules after boot, this feature may be used
449 to override that restriction).
452 bool "Boottime Graphics Resource Table support"
453 depends on EFI && (X86 || ARM64)
455 This driver adds support for exposing the ACPI Boottime Graphics
456 Resource Table, which allows the operating system to obtain
457 data from the firmware boot splash. It will appear under
458 /sys/firmware/acpi/bgrt/ .
460 config ACPI_REDUCED_HARDWARE_ONLY
461 bool "Hardware-reduced ACPI support only" if EXPERT
464 This config item changes the way the ACPI code is built. When this
465 option is selected, the kernel will use a specialized version of
466 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
467 resulting kernel will be smaller but it will also be restricted to
468 running in ACPI reduced hardware mode ONLY.
470 If you are unsure what to do, do not enable this option.
472 source "drivers/acpi/nfit/Kconfig"
474 source "drivers/acpi/apei/Kconfig"
475 source "drivers/acpi/dptf/Kconfig"
481 tristate "Extended Error Log support"
482 depends on X86_MCE && X86_LOCAL_APIC && EDAC
486 Certain usages such as Predictive Failure Analysis (PFA) require
487 more information about the error than what can be described in
488 processor machine check banks. Most server processors log
489 additional information about the error in processor uncore
490 registers. Since the addresses and layout of these registers vary
491 widely from one processor to another, system software cannot
492 readily make use of them. To complicate matters further, some of
493 the additional error information cannot be constructed without
494 detailed knowledge about platform topology.
496 Enhanced MCA Logging allows firmware to provide additional error
497 information to system software, synchronous with MCE or CMCI. This
498 driver adds support for that functionality with corresponding
499 tracepoint which carries that information to userspace.
501 menuconfig PMIC_OPREGION
502 bool "PMIC (Power Management Integrated Circuit) operation region support"
504 Select this option to enable support for ACPI operation
505 region of the PMIC chip. The operation region can be used
506 to control power rails and sensor reading/writing on the
510 config CRC_PMIC_OPREGION
511 bool "ACPI operation region support for CrystalCove PMIC"
512 depends on INTEL_SOC_PMIC
514 This config adds ACPI operation region support for CrystalCove PMIC.
516 config XPOWER_PMIC_OPREGION
517 bool "ACPI operation region support for XPower AXP288 PMIC"
518 depends on MFD_AXP20X_I2C
520 This config adds ACPI operation region support for XPower AXP288 PMIC.
522 config BXT_WC_PMIC_OPREGION
523 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
524 depends on INTEL_SOC_PMIC_BXTWC
526 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
528 config CHT_WC_PMIC_OPREGION
529 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
530 depends on INTEL_SOC_PMIC_CHTWC
532 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
534 config CHT_DC_TI_PMIC_OPREGION
535 bool "ACPI operation region support for Dollar Cove TI PMIC"
536 depends on INTEL_SOC_PMIC_CHTDC_TI
538 This config adds ACPI operation region support for Dollar Cove TI PMIC.
543 tristate "ACPI configfs support"
546 Select this option to enable support for ACPI configuration from
547 userspace. The configurable ACPI groups will be visible under
548 /config/acpi, assuming configfs is mounted under /config.
551 source "drivers/acpi/arm64/Kconfig"
557 config TPS68470_PMIC_OPREGION
558 bool "ACPI operation region support for TPS68470 PMIC"
559 depends on MFD_TPS68470
561 This config adds ACPI operation region support for TI TPS68470 PMIC.
562 TPS68470 device is an advanced power management unit that powers
563 a Compact Camera Module (CCM), generates clocks for image sensors,
564 drives a dual LED for flash and incorporates two LED drivers for
565 general purpose indicators.
566 This driver enables ACPI operation region support control voltage
567 regulators and clocks.
569 This option is a bool as it provides an ACPI operation
570 region, which must be available before any of the devices
571 using this, are probed.
576 bool "Power Management Timer Support" if EXPERT
577 depends on X86 && (ACPI || JAILHOUSE_GUEST)
580 The Power Management Timer is available on all ACPI-capable,
581 in most cases even if ACPI is unusable or blacklisted.
583 This timing source is not affected by power management features
584 like aggressive processor idling, throttling, frequency and/or
585 voltage scaling, unlike the commonly used Time Stamp Counter
588 You should nearly always say Y here because many modern
589 systems require this timer.