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 ACPI_PROCESSOR
245 depends on IA64 || X86
247 config ACPI_PROCESSOR_IDLE
256 depends on ACPI_PROCESSOR
260 If this option is enabled, this file implements common functionality
261 to parse CPPC tables as described in the ACPI 5.1+ spec. The
262 routines implemented are meant to be used by other
263 drivers to control CPU performance using CPPC semantics.
264 If your platform does not support CPPC in firmware,
265 leave this option disabled.
267 config ACPI_PROCESSOR
269 depends on X86 || IA64 || ARM64
270 select ACPI_PROCESSOR_IDLE
271 select ACPI_CPU_FREQ_PSS if X86 || IA64
274 This driver adds support for the ACPI Processor package. It is required
275 by several flavors of cpufreq performance-state, thermal, throttling and
278 To compile this driver as a module, choose M here:
279 the module will be called processor.
283 depends on IPMI_HANDLER
285 This driver enables the ACPI to access the BMC controller. And it
286 uses the IPMI request/response message to communicate with BMC
287 controller, which can be found on on the server.
289 To compile this driver as a module, choose M here:
290 the module will be called as acpi_ipmi.
292 config ACPI_HOTPLUG_CPU
294 depends on ACPI_PROCESSOR && HOTPLUG_CPU
295 select ACPI_CONTAINER
298 config ACPI_PROCESSOR_AGGREGATOR
299 tristate "Processor Aggregator"
300 depends on ACPI_PROCESSOR
303 ACPI 4.0 defines processor Aggregator, which enables OS to perform
304 specific processor configuration and control that applies to all
305 processors in the platform. Currently only logical processor idling
306 is defined, which is to reduce power consumption. This driver
307 supports the new device.
310 tristate "Thermal Zone"
311 depends on ACPI_PROCESSOR
315 This driver supports ACPI thermal zones. Most mobile and
316 some desktop systems support ACPI thermal zones. It is HIGHLY
317 recommended that this option be enabled, as your processor(s)
318 may be damaged without it.
320 To compile this driver as a module, choose M here:
321 the module will be called thermal.
323 config ACPI_CUSTOM_DSDT_FILE
324 string "Custom DSDT Table file to include"
326 depends on !STANDALONE
328 This option supports a custom DSDT by linking it into the kernel.
329 See Documentation/admin-guide/acpi/dsdt-override.rst
331 Enter the full path name to the file which includes the AmlCode
332 or dsdt_aml_code declaration.
334 If unsure, don't enter a file name.
336 config ACPI_CUSTOM_DSDT
338 default ACPI_CUSTOM_DSDT_FILE != ""
340 config ARCH_HAS_ACPI_TABLE_UPGRADE
343 config ACPI_TABLE_UPGRADE
344 bool "Allow upgrading ACPI tables via initrd"
345 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
348 This option provides functionality to upgrade arbitrary ACPI tables
349 via initrd. No functional change if no ACPI tables are passed via
350 initrd, therefore it's safe to say Y.
351 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
353 config ACPI_TABLE_OVERRIDE_VIA_BUILTIN_INITRD
354 bool "Override ACPI tables from built-in initrd"
355 depends on ACPI_TABLE_UPGRADE
356 depends on INITRAMFS_SOURCE!="" && INITRAMFS_COMPRESSION=""
358 This option provides functionality to override arbitrary ACPI tables
359 from built-in uncompressed initrd.
361 See Documentation/admin-guide/acpi/initrd_table_override.rst for details
364 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/firmware-guide/acpi/debug.rst and
371 Documentation/admin-guide/kernel-parameters.rst to control the type and
372 amount of debug output.
375 bool "PCI slot detection driver"
376 depends on SYSFS && PCI
378 This driver creates entries in /sys/bus/pci/slots/ for all PCI
379 slots in the system. This can help correlate PCI bus addresses,
380 i.e., segment/bus/device/function tuples, with physical slots in
381 the system. If you are unsure, say N.
383 config ACPI_CONTAINER
384 bool "Container and Module Devices"
385 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
387 This driver supports ACPI Container and Module devices (IDs
388 ACPI0004, PNP0A05, and PNP0A06).
390 This helps support hotplug of nodes, CPUs, and memory.
392 To compile this driver as a module, choose M here:
393 the module will be called container.
395 config ACPI_HOTPLUG_MEMORY
396 bool "Memory Hotplug"
397 depends on MEMORY_HOTPLUG
399 This driver supports ACPI memory hotplug. The driver
400 fields notifications on ACPI memory devices (PNP0C80),
401 which represent memory ranges that may be onlined or
402 offlined during runtime.
404 If your hardware and firmware do not support adding or
405 removing memory devices at runtime, you need not enable
408 To compile this driver as a module, choose M here:
409 the module will be called acpi_memhotplug.
411 config ACPI_HOTPLUG_IOAPIC
414 depends on X86_IO_APIC
418 tristate "Smart Battery System"
422 This driver supports the Smart Battery System, another
423 type of access to battery information, found on some laptops.
425 To compile this driver as a module, choose M here:
426 the modules will be called sbs and sbshc.
429 tristate "Hardware Error Device"
431 This driver supports the Hardware Error Device (PNP0C33),
432 which is used to report some hardware errors notified via
433 SCI, mainly the corrected errors.
435 config ACPI_CUSTOM_METHOD
436 tristate "Allow ACPI methods to be inserted/replaced at run time"
439 This debug facility allows ACPI AML methods to be inserted and/or
440 replaced without rebooting the system. For details refer to:
441 Documentation/firmware-guide/acpi/method-customizing.rst.
443 NOTE: This option is security sensitive, because it allows arbitrary
444 kernel memory to be written to by root (uid=0) users, allowing them
445 to bypass certain security measures (e.g. if root is not allowed to
446 load additional kernel modules after boot, this feature may be used
447 to override that restriction).
450 bool "Boottime Graphics Resource Table support"
451 depends on EFI && (X86 || ARM64)
453 This driver adds support for exposing the ACPI Boottime Graphics
454 Resource Table, which allows the operating system to obtain
455 data from the firmware boot splash. It will appear under
456 /sys/firmware/acpi/bgrt/ .
458 config ACPI_REDUCED_HARDWARE_ONLY
459 bool "Hardware-reduced ACPI support only" if EXPERT
462 This config item changes the way the ACPI code is built. When this
463 option is selected, the kernel will use a specialized version of
464 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
465 resulting kernel will be smaller but it will also be restricted to
466 running in ACPI reduced hardware mode ONLY.
468 If you are unsure what to do, do not enable this option.
470 source "drivers/acpi/nfit/Kconfig"
471 source "drivers/acpi/numa/Kconfig"
472 source "drivers/acpi/apei/Kconfig"
473 source "drivers/acpi/dptf/Kconfig"
479 tristate "Extended Error Log support"
480 depends on X86_MCE && X86_LOCAL_APIC && EDAC
483 Certain usages such as Predictive Failure Analysis (PFA) require
484 more information about the error than what can be described in
485 processor machine check banks. Most server processors log
486 additional information about the error in processor uncore
487 registers. Since the addresses and layout of these registers vary
488 widely from one processor to another, system software cannot
489 readily make use of them. To complicate matters further, some of
490 the additional error information cannot be constructed without
491 detailed knowledge about platform topology.
493 Enhanced MCA Logging allows firmware to provide additional error
494 information to system software, synchronous with MCE or CMCI. This
495 driver adds support for that functionality with corresponding
496 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 BYTCRC_PMIC_OPREGION
511 bool "ACPI operation region support for Bay Trail Crystal Cove PMIC"
512 depends on INTEL_SOC_PMIC
514 This config adds ACPI operation region support for the Bay Trail
515 version of the Crystal Cove PMIC.
517 config CHTCRC_PMIC_OPREGION
518 bool "ACPI operation region support for Cherry Trail Crystal Cove PMIC"
519 depends on INTEL_SOC_PMIC
521 This config adds ACPI operation region support for the Cherry Trail
522 version of the Crystal Cove PMIC.
524 config XPOWER_PMIC_OPREGION
525 bool "ACPI operation region support for XPower AXP288 PMIC"
526 depends on MFD_AXP20X_I2C && IOSF_MBI=y
528 This config adds ACPI operation region support for XPower AXP288 PMIC.
530 config BXT_WC_PMIC_OPREGION
531 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
532 depends on INTEL_SOC_PMIC_BXTWC
534 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
536 config CHT_WC_PMIC_OPREGION
537 bool "ACPI operation region support for CHT Whiskey Cove PMIC"
538 depends on INTEL_SOC_PMIC_CHTWC
540 This config adds ACPI operation region support for CHT Whiskey Cove PMIC.
542 config CHT_DC_TI_PMIC_OPREGION
543 bool "ACPI operation region support for Dollar Cove TI PMIC"
544 depends on INTEL_SOC_PMIC_CHTDC_TI
546 This config adds ACPI operation region support for Dollar Cove TI PMIC.
551 tristate "ACPI configfs support"
554 Select this option to enable support for ACPI configuration from
555 userspace. The configurable ACPI groups will be visible under
556 /config/acpi, assuming configfs is mounted under /config.
559 source "drivers/acpi/arm64/Kconfig"
565 config TPS68470_PMIC_OPREGION
566 bool "ACPI operation region support for TPS68470 PMIC"
567 depends on MFD_TPS68470
569 This config adds ACPI operation region support for TI TPS68470 PMIC.
570 TPS68470 device is an advanced power management unit that powers
571 a Compact Camera Module (CCM), generates clocks for image sensors,
572 drives a dual LED for flash and incorporates two LED drivers for
573 general purpose indicators.
574 This driver enables ACPI operation region support control voltage
575 regulators and clocks.
577 This option is a bool as it provides an ACPI operation
578 region, which must be available before any of the devices
579 using this, are probed.
584 bool "Power Management Timer Support" if EXPERT
585 depends on X86 && (ACPI || JAILHOUSE_GUEST)
588 The Power Management Timer is available on all ACPI-capable,
589 in most cases even if ACPI is unusable or blacklisted.
591 This timing source is not affected by power management features
592 like aggressive processor idling, throttling, frequency and/or
593 voltage scaling, unlike the commonly used Time Stamp Counter
596 You should nearly always say Y here because many modern
597 systems require this timer.