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"
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.
173 This driver adds support for battery information through
174 /proc/acpi/battery. If you have a mobile system with a battery,
177 To compile this driver as a module, choose M here:
178 the module will be called battery.
185 This driver handles events on the power, sleep, and lid buttons.
186 A daemon reads events from input devices or via netlink and
187 performs user-defined actions such as shutting down the system.
188 This is necessary for software-controlled poweroff.
190 To compile this driver as a module, choose M here:
191 the module will be called button.
195 depends on X86 && BACKLIGHT_CLASS_DEVICE
199 This driver implements the ACPI Extensions For Display Adapters
200 for integrated graphics devices on motherboard, as specified in
201 ACPI 2.0 Specification, Appendix B. This supports basic operations
202 such as defining the video POST device, retrieving EDID information,
203 and setting up a video output.
205 To compile this driver as a module, choose M here:
206 the module will be called video.
213 This driver supports ACPI fan devices, allowing user-mode
214 applications to perform basic fan control (on, off, status).
216 To compile this driver as a module, choose M here:
217 the module will be called fan.
220 tristate "ACPI Time and Alarm (TAD) Device Support"
221 depends on SYSFS && PM_SLEEP
223 The ACPI Time and Alarm (TAD) device is an alternative to the Real
224 Time Clock (RTC). Its wake timers allow the system to transition from
225 the S3 (or optionally S4/S5) state to S0 state after a time period
226 elapses. In comparison with the RTC Alarm, the TAD provides a larger
227 scale of flexibility in the wake timers. The time capabilities of the
228 TAD maintain the time of day information across platform power
229 transitions, and keep track of time even when the platform is turned
235 This driver supports ACPI-controlled docking stations and removable
236 drive bays such as the IBM Ultrabay and the Dell Module Bay.
238 config ACPI_CPU_FREQ_PSS
242 config ACPI_PROCESSOR_CSTATE
244 depends on IA64 || X86
246 config ACPI_PROCESSOR_IDLE
255 depends on ACPI_PROCESSOR
259 If this option is enabled, this file implements common functionality
260 to parse CPPC tables as described in the ACPI 5.1+ spec. The
261 routines implemented are meant to be used by other
262 drivers to control CPU performance using CPPC semantics.
263 If your platform does not support CPPC in firmware,
264 leave this option disabled.
266 config ACPI_PROCESSOR
268 depends on X86 || IA64 || ARM64
269 select ACPI_PROCESSOR_IDLE
270 select ACPI_CPU_FREQ_PSS if X86 || IA64
273 This driver adds support for the ACPI Processor package. It is required
274 by several flavors of cpufreq performance-state, thermal, throttling and
277 To compile this driver as a module, choose M here:
278 the module will be called processor.
282 depends on IPMI_HANDLER
284 This driver enables the ACPI to access the BMC controller. And it
285 uses the IPMI request/response message to communicate with BMC
286 controller, which can be found on on the server.
288 To compile this driver as a module, choose M here:
289 the module will be called as acpi_ipmi.
291 config ACPI_HOTPLUG_CPU
293 depends on ACPI_PROCESSOR && HOTPLUG_CPU
294 select ACPI_CONTAINER
297 config ACPI_PROCESSOR_AGGREGATOR
298 tristate "Processor Aggregator"
299 depends on ACPI_PROCESSOR
302 ACPI 4.0 defines processor Aggregator, which enables OS to perform
303 specific processor configuration and control that applies to all
304 processors in the platform. Currently only logical processor idling
305 is defined, which is to reduce power consumption. This driver
306 supports the new device.
309 tristate "Thermal Zone"
310 depends on ACPI_PROCESSOR
314 This driver supports ACPI thermal zones. Most mobile and
315 some desktop systems support ACPI thermal zones. It is HIGHLY
316 recommended that this option be enabled, as your processor(s)
317 may be damaged without it.
319 To compile this driver as a module, choose M here:
320 the module will be called thermal.
325 depends on (X86 || IA64 || ARM64)
326 default y if IA64 || ARM64
328 config ACPI_CUSTOM_DSDT_FILE
329 string "Custom DSDT Table file to include"
331 depends on !STANDALONE
333 This option supports a custom DSDT by linking it into the kernel.
334 See Documentation/admin-guide/acpi/dsdt-override.rst
336 Enter the full path name to the file which includes the AmlCode
337 or dsdt_aml_code declaration.
339 If unsure, don't enter a file name.
341 config ACPI_CUSTOM_DSDT
343 default ACPI_CUSTOM_DSDT_FILE != ""
345 config ARCH_HAS_ACPI_TABLE_UPGRADE
348 config ACPI_TABLE_UPGRADE
349 bool "Allow upgrading ACPI tables via initrd"
350 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
353 This option provides functionality to upgrade arbitrary ACPI tables
354 via initrd. No functional change if no ACPI tables are passed via
355 initrd, therefore it's safe to say Y.
356 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
358 config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD
359 bool "Override ACPI tables from built-in initrd"
360 depends on ACPI_TABLE_UPGRADE
361 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION=""
363 This option provides functionality to override arbitrary ACPI tables
364 from built-in uncompressed initrd.
366 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
369 bool "Debug Statements"
371 The ACPI subsystem can produce debug output. Saying Y enables this
372 output and increases the kernel size by around 50K.
374 Use the acpi.debug_layer and acpi.debug_level kernel command-line
375 parameters documented in Documentation/firmware-guide/acpi/debug.rst and
376 Documentation/admin-guide/kernel-parameters.rst to control the type and
377 amount of debug output.
380 bool "PCI slot detection driver"
381 depends on SYSFS && PCI
383 This driver creates entries in /sys/bus/pci/slots/ for all PCI
384 slots in the system. This can help correlate PCI bus addresses,
385 i.e., segment/bus/device/function tuples, with physical slots in
386 the system. If you are unsure, say N.
388 config ACPI_CONTAINER
389 bool "Container and Module Devices"
390 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
392 This driver supports ACPI Container and Module devices (IDs
393 ACPI0004, PNP0A05, and PNP0A06).
395 This helps support hotplug of nodes, CPUs, and memory.
397 To compile this driver as a module, choose M here:
398 the module will be called container.
400 config ACPI_HOTPLUG_MEMORY
401 bool "Memory Hotplug"
402 depends on MEMORY_HOTPLUG
404 This driver supports ACPI memory hotplug. The driver
405 fields notifications on ACPI memory devices (PNP0C80),
406 which represent memory ranges that may be onlined or
407 offlined during runtime.
409 If your hardware and firmware do not support adding or
410 removing memory devices at runtime, you need not enable
413 To compile this driver as a module, choose M here:
414 the module will be called acpi_memhotplug.
416 config ACPI_HOTPLUG_IOAPIC
419 depends on X86_IO_APIC
423 tristate "Smart Battery System"
427 This driver supports the Smart Battery System, another
428 type of access to battery information, found on some laptops.
430 To compile this driver as a module, choose M here:
431 the modules will be called sbs and sbshc.
434 tristate "Hardware Error Device"
436 This driver supports the Hardware Error Device (PNP0C33),
437 which is used to report some hardware errors notified via
438 SCI, mainly the corrected errors.
440 config ACPI_CUSTOM_METHOD
441 tristate "Allow ACPI methods to be inserted/replaced at run time"
444 This debug facility allows ACPI AML methods to be inserted and/or
445 replaced without rebooting the system. For details refer to:
446 Documentation/firmware-guide/acpi/method-customizing.rst.
448 NOTE: This option is security sensitive, because it allows arbitrary
449 kernel memory to be written to by root (uid=0) users, allowing them
450 to bypass certain security measures (e.g. if root is not allowed to
451 load additional kernel modules after boot, this feature may be used
452 to override that restriction).
455 bool "Boottime Graphics Resource Table support"
456 depends on EFI && (X86 || ARM64)
458 This driver adds support for exposing the ACPI Boottime Graphics
459 Resource Table, which allows the operating system to obtain
460 data from the firmware boot splash. It will appear under
461 /sys/firmware/acpi/bgrt/ .
463 config ACPI_REDUCED_HARDWARE_ONLY
464 bool "Hardware-reduced ACPI support only" if EXPERT
467 This config item changes the way the ACPI code is built. When this
468 option is selected, the kernel will use a specialized version of
469 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
470 resulting kernel will be smaller but it will also be restricted to
471 running in ACPI reduced hardware mode ONLY.
473 If you are unsure what to do, do not enable this option.
475 source "drivers/acpi/nfit/Kconfig"
476 source "drivers/acpi/hmat/Kconfig"
478 source "drivers/acpi/apei/Kconfig"
479 source "drivers/acpi/dptf/Kconfig"
485 tristate "Extended Error Log support"
486 depends on X86_MCE && X86_LOCAL_APIC && EDAC
489 Certain usages such as Predictive Failure Analysis (PFA) require
490 more information about the error than what can be described in
491 processor machine check banks. Most server processors log
492 additional information about the error in processor uncore
493 registers. Since the addresses and layout of these registers vary
494 widely from one processor to another, system software cannot
495 readily make use of them. To complicate matters further, some of
496 the additional error information cannot be constructed without
497 detailed knowledge about platform topology.
499 Enhanced MCA Logging allows firmware to provide additional error
500 information to system software, synchronous with MCE or CMCI. This
501 driver adds support for that functionality with corresponding
502 tracepoint which carries that information to userspace.
507 menuconfig PMIC_OPREGION
508 bool "PMIC (Power Management Integrated Circuit) operation region support"
510 Select this option to enable support for ACPI operation
511 region of the PMIC chip. The operation region can be used
512 to control power rails and sensor reading/writing on the
516 config CRC_PMIC_OPREGION
517 bool "ACPI operation region support for CrystalCove PMIC"
518 depends on INTEL_SOC_PMIC
520 This config adds ACPI operation region support for CrystalCove PMIC.
522 config XPOWER_PMIC_OPREGION
523 bool "ACPI operation region support for XPower AXP288 PMIC"
524 depends on MFD_AXP20X_I2C && IOSF_MBI=y
526 This config adds ACPI operation region support for XPower AXP288 PMIC.
528 config BXT_WC_PMIC_OPREGION
529 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
530 depends on INTEL_SOC_PMIC_BXTWC
532 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
534 config CHT_WC_PMIC_OPREGION
535 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
536 depends on INTEL_SOC_PMIC_CHTWC
538 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
540 config CHT_DC_TI_PMIC_OPREGION
541 bool "ACPI operation region support for Dollar Cove TI PMIC"
542 depends on INTEL_SOC_PMIC_CHTDC_TI
544 This config adds ACPI operation region support for Dollar Cove TI PMIC.
549 tristate "ACPI configfs support"
552 Select this option to enable support for ACPI configuration from
553 userspace. The configurable ACPI groups will be visible under
554 /config/acpi, assuming configfs is mounted under /config.
557 source "drivers/acpi/arm64/Kconfig"
563 config TPS68470_PMIC_OPREGION
564 bool "ACPI operation region support for TPS68470 PMIC"
565 depends on MFD_TPS68470
567 This config adds ACPI operation region support for TI TPS68470 PMIC.
568 TPS68470 device is an advanced power management unit that powers
569 a Compact Camera Module (CCM), generates clocks for image sensors,
570 drives a dual LED for flash and incorporates two LED drivers for
571 general purpose indicators.
572 This driver enables ACPI operation region support control voltage
573 regulators and clocks.
575 This option is a bool as it provides an ACPI operation
576 region, which must be available before any of the devices
577 using this, are probed.
582 bool "Power Management Timer Support" if EXPERT
583 depends on X86 && (ACPI || JAILHOUSE_GUEST)
586 The Power Management Timer is available on all ACPI-capable,
587 in most cases even if ACPI is unusable or blacklisted.
589 This timing source is not affected by power management features
590 like aggressive processor idling, throttling, frequency and/or
591 voltage scaling, unlike the commonly used Time Stamp Counter
594 You should nearly always say Y here because many modern
595 systems require this timer.