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
18 Advanced Configuration and Power Interface (ACPI) support for
19 Linux requires an ACPI-compliant platform (hardware/firmware),
20 and assumes the presence of OS-directed configuration and power
21 management (OSPM) software. This option will enlarge your
24 Linux ACPI provides a robust functional replacement for several
25 legacy configuration and power management interfaces, including
26 the Plug-and-Play BIOS specification (PnP BIOS), the
27 MultiProcessor Specification (MPS), and the Advanced Power
28 Management (APM) specification. If both ACPI and APM support
29 are configured, ACPI is used.
31 Linux support for ACPI is based on Intel Corporation's ACPI
32 Component Architecture (ACPI CA). For more information on the
36 ACPI is an open industry specification originally co-developed by
37 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
38 it is developed by the ACPI Specification Working Group (ASWG) under
39 the UEFI Forum and any UEFI member can join the ASWG and contribute
40 to the ACPI specification.
41 The specification is available at:
42 <https://uefi.org/specifications>
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
64 config ACPI_THERMAL_LIB
69 bool "AML debugger interface"
72 Enable in-kernel debugging of AML facilities: statistics,
73 internal object dump, single step control method execution.
74 This is still under development, currently enabling this only
75 results in the compilation of the ACPICA debugger files.
79 config ACPI_DEBUGGER_USER
80 tristate "Userspace debugger accessibility"
83 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
84 to access the debugger functionalities.
88 config ACPI_SPCR_TABLE
89 bool "ACPI Serial Port Console Redirection Support"
92 Enable support for Serial Port Console Redirection (SPCR) Table.
93 This table provides information about the configuration of the
97 bool "ACPI Firmware Performance Data Table (FPDT) support"
98 depends on X86_64 || ARM64
100 Enable support for the Firmware Performance Data Table (FPDT).
101 This table provides information on the timing of the system
102 boot, S3 suspend and S3 resume firmware code paths.
111 depends on SUSPEND || HIBERNATION
112 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
115 config ACPI_REV_OVERRIDE_POSSIBLE
116 bool "Allow supported ACPI revision to be overridden"
120 The platform firmware on some systems expects Linux to return "5" as
121 the supported ACPI revision which makes it expose system configuration
122 information in a special way.
124 For example, based on what ACPI exports as the supported revision,
125 Dell XPS 13 (2015) configures its audio device to either work in HDA
126 mode or in I2S mode, where the former is supposed to be used on Linux
127 until the latter is fully supported (in the kernel as well as in user
130 This option enables a DMI-based quirk for the above Dell machine (so
131 that HDA audio is exposed by the platform firmware to the kernel) and
132 makes it possible to force the kernel to return "5" as the supported
133 ACPI revision via the "acpi_rev_override" command line switch.
136 bool "Embedded Controller"
137 depends on HAS_IOPORT
140 This driver handles communication with the microcontroller
141 on many x86 laptops and other machines.
143 config ACPI_EC_DEBUGFS
144 tristate "EC read/write access through /sys/kernel/debug/ec"
147 Say N to disable Embedded Controller /sys/kernel/debug interface
149 Be aware that using this interface can confuse your Embedded
150 Controller in a way that a normal reboot is not enough. You then
151 have to power off your system, and remove the laptop battery for
153 An Embedded Controller typically is available on laptops and reads
154 sensor values like battery state and temperature.
155 The kernel accesses the EC through ACPI parsed code provided by BIOS
156 tables. This option allows to access the EC directly without ACPI
158 Thus this option is a debug option that helps to write ACPI drivers
159 and can be used to identify ACPI code or EC firmware bugs.
162 tristate "AC Adapter"
166 This driver supports the AC Adapter object, which indicates
167 whether a system is on AC or not. If you have a system that can
168 switch between A/C and battery, say Y.
170 To compile this driver as a module, choose M here:
171 the module will be called ac.
178 This driver adds support for battery information through
179 /proc/acpi/battery. If you have a mobile system with a battery,
182 To compile this driver as a module, choose M here:
183 the module will be called battery.
190 This driver handles events on the power, sleep, and lid buttons.
191 A daemon reads events from input devices or via netlink and
192 performs user-defined actions such as shutting down the system.
193 This is necessary for software-controlled poweroff.
195 To compile this driver as a module, choose M here:
196 the module will be called button.
198 config ACPI_TINY_POWER_BUTTON
199 tristate "Tiny Power Button Driver"
200 depends on !ACPI_BUTTON
202 This driver provides a tiny alternative to the ACPI Button driver.
203 The tiny power button driver only handles the power button. Rather
204 than notifying userspace via the input layer or a netlink event, this
205 driver directly signals the init process to shut down.
207 This driver is particularly suitable for cloud and VM environments,
208 which use a simulated power button to initiate a controlled poweroff,
209 but which may not want to run a separate userspace daemon to process
212 config ACPI_TINY_POWER_BUTTON_SIGNAL
213 int "Tiny Power Button Signal"
214 depends on ACPI_TINY_POWER_BUTTON
217 Default signal to send to init in response to the power button.
219 Likely values here include 38 (SIGRTMIN+4) to power off, or 2
220 (SIGINT) to simulate Ctrl+Alt+Del.
224 depends on BACKLIGHT_CLASS_DEVICE
226 depends on ACPI_WMI || !X86
229 This driver implements the ACPI Extensions For Display Adapters
230 for integrated graphics devices on motherboard, as specified in
231 ACPI 2.0 Specification, Appendix B. This supports basic operations
232 such as defining the video POST device, retrieving EDID information,
233 and setting up a video output.
235 To compile this driver as a module, choose M here:
236 the module will be called video.
243 This driver supports ACPI fan devices, allowing user-mode
244 applications to perform basic fan control (on, off, status).
246 To compile this driver as a module, choose M here:
247 the module will be called fan.
250 tristate "ACPI Time and Alarm (TAD) Device Support"
251 depends on SYSFS && PM_SLEEP
253 The ACPI Time and Alarm (TAD) device is an alternative to the Real
254 Time Clock (RTC). Its wake timers allow the system to transition from
255 the S3 (or optionally S4/S5) state to S0 state after a time period
256 elapses. In comparison with the RTC Alarm, the TAD provides a larger
257 scale of flexibility in the wake timers. The time capabilities of the
258 TAD maintain the time of day information across platform power
259 transitions, and keep track of time even when the platform is turned
265 This driver supports ACPI-controlled docking stations and removable
266 drive bays such as the IBM Ultrabay and the Dell Module Bay.
268 config ACPI_CPU_FREQ_PSS
271 config ACPI_PROCESSOR_CSTATE
273 depends on ACPI_PROCESSOR
276 config ACPI_PROCESSOR_IDLE
285 depends on ACPI_PROCESSOR
289 If this option is enabled, this file implements common functionality
290 to parse CPPC tables as described in the ACPI 5.1+ spec. The
291 routines implemented are meant to be used by other
292 drivers to control CPU performance using CPPC semantics.
293 If your platform does not support CPPC in firmware,
294 leave this option disabled.
296 config ACPI_PROCESSOR
298 depends on X86 || ARM64 || LOONGARCH || RISCV
299 select ACPI_PROCESSOR_IDLE
300 select ACPI_CPU_FREQ_PSS if X86 || LOONGARCH
304 This driver adds support for the ACPI Processor package. It is required
305 by several flavors of cpufreq performance-state, thermal, throttling and
308 To compile this driver as a module, choose M here:
309 the module will be called processor.
313 depends on IPMI_HANDLER
315 This driver enables the ACPI to access the BMC controller. And it
316 uses the IPMI request/response message to communicate with BMC
317 controller, which can be found on the server.
319 To compile this driver as a module, choose M here:
320 the module will be called as acpi_ipmi.
322 config ACPI_HOTPLUG_CPU
324 depends on ACPI_PROCESSOR && HOTPLUG_CPU
325 select ACPI_CONTAINER
327 config ACPI_PROCESSOR_AGGREGATOR
328 tristate "Processor Aggregator"
329 depends on ACPI_PROCESSOR
332 ACPI 4.0 defines processor Aggregator, which enables OS to perform
333 specific processor configuration and control that applies to all
334 processors in the platform. Currently only logical processor idling
335 is defined, which is to reduce power consumption. This driver
336 supports the new device.
339 tristate "Thermal Zone"
340 depends on ACPI_PROCESSOR
342 select ACPI_THERMAL_LIB
345 This driver supports ACPI thermal zones. Most mobile and
346 some desktop systems support ACPI thermal zones. It is HIGHLY
347 recommended that this option be enabled, as your processor(s)
348 may be damaged without it.
350 To compile this driver as a module, choose M here:
351 the module will be called thermal.
353 config ACPI_PLATFORM_PROFILE
356 config ACPI_CUSTOM_DSDT_FILE
357 string "Custom DSDT Table file to include"
359 depends on !STANDALONE
361 This option supports a custom DSDT by linking it into the kernel.
363 Enter the full path name to the file which includes the AmlCode
364 or dsdt_aml_code declaration.
366 If unsure, don't enter a file name.
368 config ACPI_CUSTOM_DSDT
370 default ACPI_CUSTOM_DSDT_FILE != ""
372 config ARCH_HAS_ACPI_TABLE_UPGRADE
375 config ACPI_TABLE_UPGRADE
376 bool "Allow upgrading ACPI tables via initrd"
377 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
380 This option provides functionality to upgrade arbitrary ACPI tables
381 via initrd. No functional change if no ACPI tables are passed via
382 initrd, therefore it's safe to say Y.
383 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
385 config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD
386 bool "Override ACPI tables from built-in initrd"
387 depends on ACPI_TABLE_UPGRADE
388 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION_NONE
390 This option provides functionality to override arbitrary ACPI tables
391 from built-in uncompressed initrd.
393 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
396 bool "Debug Statements"
398 The ACPI subsystem can produce debug output. Saying Y enables this
399 output and increases the kernel size by around 50K.
401 Use the acpi.debug_layer and acpi.debug_level kernel command-line
402 parameters documented in Documentation/firmware-guide/acpi/debug.rst and
403 Documentation/admin-guide/kernel-parameters.rst to control the type and
404 amount of debug output.
407 bool "PCI slot detection driver"
408 depends on SYSFS && PCI
410 This driver creates entries in /sys/bus/pci/slots/ for all PCI
411 slots in the system. This can help correlate PCI bus addresses,
412 i.e., segment/bus/device/function tuples, with physical slots in
413 the system. If you are unsure, say N.
415 config ACPI_CONTAINER
416 bool "Container and Module Devices"
417 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
419 This driver supports ACPI Container and Module devices (IDs
420 ACPI0004, PNP0A05, and PNP0A06).
422 This helps support hotplug of nodes, CPUs, and memory.
424 config ACPI_HOTPLUG_MEMORY
425 bool "Memory Hotplug"
426 depends on MEMORY_HOTPLUG
428 This driver supports ACPI memory hotplug. The driver
429 fields notifications on ACPI memory devices (PNP0C80),
430 which represent memory ranges that may be onlined or
431 offlined during runtime.
433 If your hardware and firmware do not support adding or
434 removing memory devices at runtime, you need not enable
437 config ACPI_HOTPLUG_IOAPIC
440 depends on X86_IO_APIC
444 tristate "Smart Battery System"
445 depends on X86 && ACPI_EC
448 This driver supports the Smart Battery System, another
449 type of access to battery information, found on some laptops.
451 To compile this driver as a module, choose M here:
452 the modules will be called sbs and sbshc.
455 tristate "Hardware Error Device"
457 This driver supports the Hardware Error Device (PNP0C33),
458 which is used to report some hardware errors notified via
459 SCI, mainly the corrected errors.
462 bool "Boottime Graphics Resource Table support"
463 depends on EFI && (X86 || ARM64 || LOONGARCH)
465 This driver adds support for exposing the ACPI Boottime Graphics
466 Resource Table, which allows the operating system to obtain
467 data from the firmware boot splash. It will appear under
468 /sys/firmware/acpi/bgrt/ .
470 config ACPI_REDUCED_HARDWARE_ONLY
471 bool "Hardware-reduced ACPI support only" if EXPERT
473 This config item changes the way the ACPI code is built. When this
474 option is selected, the kernel will use a specialized version of
475 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
476 resulting kernel will be smaller but it will also be restricted to
477 running in ACPI reduced hardware mode ONLY.
479 If you are unsure what to do, do not enable this option.
484 source "drivers/acpi/nfit/Kconfig"
485 source "drivers/acpi/numa/Kconfig"
486 source "drivers/acpi/apei/Kconfig"
487 source "drivers/acpi/dptf/Kconfig"
493 tristate "Extended Error Log support"
494 depends on X86_MCE && X86_LOCAL_APIC && EDAC
497 Certain usages such as Predictive Failure Analysis (PFA) require
498 more information about the error than what can be described in
499 processor machine check banks. Most server processors log
500 additional information about the error in processor uncore
501 registers. Since the addresses and layout of these registers vary
502 widely from one processor to another, system software cannot
503 readily make use of them. To complicate matters further, some of
504 the additional error information cannot be constructed without
505 detailed knowledge about platform topology.
507 Enhanced MCA Logging allows firmware to provide additional error
508 information to system software, synchronous with MCE or CMCI. This
509 driver adds support for that functionality with corresponding
510 tracepoint which carries that information to userspace.
516 tristate "ACPI configfs support"
519 Select this option to enable support for ACPI configuration from
520 userspace. The configurable ACPI groups will be visible under
521 /config/acpi, assuming configfs is mounted under /config.
524 tristate "ACPI Platform Firmware Runtime Update and Telemetry"
527 This mechanism allows certain pieces of the platform firmware
528 to be updated on the fly while the system is running (runtime)
529 without the need to restart it, which is key in the cases when
530 the system needs to be available 100% of the time and it cannot
531 afford the downtime related to restarting it, or when the work
532 carried out by the system is particularly important, so it cannot
533 be interrupted, and it is not practical to wait until it is complete.
535 The existing firmware code can be modified (driver update) or
536 extended by adding new code to the firmware (code injection).
538 Besides, the telemetry driver allows user space to fetch telemetry
539 data from the firmware with the help of the Platform Firmware Runtime
542 To compile the drivers as modules, choose M here:
543 the modules will be called pfr_update and pfr_telemetry.
546 source "drivers/acpi/arm64/Kconfig"
553 bool "ACPI PCC Address Space"
557 The PCC Address Space also referred as PCC Operation Region pertains
558 to the region of PCC subspace that succeeds the PCC signature.
560 The PCC Operation Region works in conjunction with the PCC Table
561 (Platform Communications Channel Table). PCC subspaces that are
562 marked for use as PCC Operation Regions must not be used as PCC
563 subspaces for the standard ACPI features such as CPPC, RASF, PDTT and
564 MPST. These standard features must always use the PCC Table instead.
566 Enable this feature if you want to set up and install the PCC Address
567 Space handler to handle PCC OpRegion in the firmware.
570 bool "ACPI FFH Address Space"
573 The FFH(Fixed Function Hardware) Address Space also referred as FFH
574 Operation Region allows to define platform specific opregion.
576 Enable this feature if you want to set up and install the FFH Address
577 Space handler to handle FFH OpRegion in the firmware.
579 source "drivers/acpi/pmic/Kconfig"
585 bool "Platform Runtime Mechanism Support"
586 depends on EFI_RUNTIME_WRAPPERS && (X86_64 || ARM64)
589 Platform Runtime Mechanism (PRM) is a firmware interface exposing a
590 set of binary executables that can be called from the AML interpreter
591 or directly from device drivers.
593 Say Y to enable the AML interpreter to execute the PRM code.
595 While this feature is optional in principle, leaving it out may
596 substantially increase computational overhead related to the
597 initialization of some server systems.
602 bool "Power Management Timer Support" if EXPERT
603 depends on X86 && (ACPI || JAILHOUSE_GUEST)
606 The Power Management Timer is available on all ACPI-capable,
607 in most cases even if ACPI is unusable or blacklisted.
609 This timing source is not affected by power management features
610 like aggressive processor idling, throttling, frequency and/or
611 voltage scaling, unlike the commonly used Time Stamp Counter
614 You should nearly always say Y here because many modern
615 systems require this timer.