6 bool "ACPI (Advanced Configuration and Power Interface) Support"
7 depends on !IA64_HP_SIM
8 depends on IA64 || X86 || ARM64
11 default y if (IA64 || X86)
13 Advanced Configuration and Power Interface (ACPI) support for
14 Linux requires an ACPI-compliant platform (hardware/firmware),
15 and assumes the presence of OS-directed configuration and power
16 management (OSPM) software. This option will enlarge your
19 Linux ACPI provides a robust functional replacement for several
20 legacy configuration and power management interfaces, including
21 the Plug-and-Play BIOS specification (PnP BIOS), the
22 MultiProcessor Specification (MPS), and the Advanced Power
23 Management (APM) specification. If both ACPI and APM support
24 are configured, ACPI is used.
26 The project home page for the Linux ACPI subsystem is here:
27 <https://01.org/linux-acpi>
29 Linux support for ACPI is based on Intel Corporation's ACPI
30 Component Architecture (ACPI CA). For more information on the
34 ACPI is an open industry specification originally co-developed by
35 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently,
36 it is developed by the ACPI Specification Working Group (ASWG) under
37 the UEFI Forum and any UEFI member can join the ASWG and contribute
38 to the ACPI specification.
39 The specification is available at:
40 <http://www.acpi.info>
41 <http://www.uefi.org/acpi/specs>
45 config ACPI_LEGACY_TABLES_LOOKUP
48 config ARCH_MIGHT_HAVE_ACPI_PDC
51 config ACPI_GENERIC_GSI
54 config ACPI_SYSTEM_POWER_STATES_SUPPORT
57 config ACPI_CCA_REQUIRED
61 bool "AML debugger interface"
64 Enable in-kernel debugging of AML facilities: statistics,
65 internal object dump, single step control method execution.
66 This is still under development, currently enabling this only
67 results in the compilation of the ACPICA debugger files.
71 config ACPI_DEBUGGER_USER
72 tristate "Userspace debugger accessiblity"
75 Export /sys/kernel/debug/acpi/acpidbg for userspace utilities
76 to access the debugger functionalities.
82 depends on SUSPEND || HIBERNATION
83 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
86 config ACPI_PROCFS_POWER
87 bool "Deprecated power /proc/acpi directories"
88 depends on X86 && PROC_FS
90 For backwards compatibility, this option allows
91 deprecated power /proc/acpi/ directories to exist, even when
92 they have been replaced by functions in /sys.
93 The deprecated directories (and their replacements) include:
94 /proc/acpi/battery/* (/sys/class/power_supply/*)
95 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
96 This option has no effect on /proc/acpi/ directories
97 and functions, which do not yet exist in /sys
98 This option, together with the proc directories, will be
99 deleted in the future.
101 Say N to delete power /proc/acpi/ directories that have moved to /sys/
103 config ACPI_REV_OVERRIDE_POSSIBLE
104 bool "Allow supported ACPI revision to be overriden"
108 The platform firmware on some systems expects Linux to return "5" as
109 the supported ACPI revision which makes it expose system configuration
110 information in a special way.
112 For example, based on what ACPI exports as the supported revision,
113 Dell XPS 13 (2015) configures its audio device to either work in HDA
114 mode or in I2S mode, where the former is supposed to be used on Linux
115 until the latter is fully supported (in the kernel as well as in user
118 This option enables a DMI-based quirk for the above Dell machine (so
119 that HDA audio is exposed by the platform firmware to the kernel) and
120 makes it possible to force the kernel to return "5" as the supported
121 ACPI revision via the "acpi_rev_override" command line switch.
123 config ACPI_EC_DEBUGFS
124 tristate "EC read/write access through /sys/kernel/debug/ec"
127 Say N to disable Embedded Controller /sys/kernel/debug interface
129 Be aware that using this interface can confuse your Embedded
130 Controller in a way that a normal reboot is not enough. You then
131 have to power off your system, and remove the laptop battery for
133 An Embedded Controller typically is available on laptops and reads
134 sensor values like battery state and temperature.
135 The kernel accesses the EC through ACPI parsed code provided by BIOS
136 tables. This option allows to access the EC directly without ACPI
138 Thus this option is a debug option that helps to write ACPI drivers
139 and can be used to identify ACPI code or EC firmware bugs.
142 tristate "AC Adapter"
147 This driver supports the AC Adapter object, which indicates
148 whether a system is on AC or not. If you have a system that can
149 switch between A/C and battery, say Y.
151 To compile this driver as a module, choose M here:
152 the module will be called ac.
160 This driver adds support for battery information through
161 /proc/acpi/battery. If you have a mobile system with a battery,
164 To compile this driver as a module, choose M here:
165 the module will be called battery.
172 This driver handles events on the power, sleep, and lid buttons.
173 A daemon reads events from input devices or via netlink and
174 performs user-defined actions such as shutting down the system.
175 This is necessary for software-controlled poweroff.
177 To compile this driver as a module, choose M here:
178 the module will be called button.
182 depends on X86 && BACKLIGHT_CLASS_DEVICE
186 This driver implements the ACPI Extensions For Display Adapters
187 for integrated graphics devices on motherboard, as specified in
188 ACPI 2.0 Specification, Appendix B. This supports basic operations
189 such as defining the video POST device, retrieving EDID information,
190 and setting up a video output.
192 To compile this driver as a module, choose M here:
193 the module will be called video.
200 This driver supports ACPI fan devices, allowing user-mode
201 applications to perform basic fan control (on, off, status).
203 To compile this driver as a module, choose M here:
204 the module will be called fan.
209 This driver supports ACPI-controlled docking stations and removable
210 drive bays such as the IBM Ultrabay and the Dell Module Bay.
212 config ACPI_CPU_FREQ_PSS
216 config ACPI_PROCESSOR_CSTATE
218 depends on IA64 || X86
220 config ACPI_PROCESSOR_IDLE
226 depends on ACPI_PROCESSOR
227 depends on !ACPI_CPU_FREQ_PSS
231 If this option is enabled, this file implements common functionality
232 to parse CPPC tables as described in the ACPI 5.1+ spec. The
233 routines implemented are meant to be used by other
234 drivers to control CPU performance using CPPC semantics.
235 If your platform does not support CPPC in firmware,
236 leave this option disabled.
238 config ACPI_PROCESSOR
240 depends on X86 || IA64 || ARM64
241 select ACPI_PROCESSOR_IDLE
242 select ACPI_CPU_FREQ_PSS if X86 || IA64
245 This driver adds support for the ACPI Processor package. It is required
246 by several flavors of cpufreq performance-state, thermal, throttling and
249 To compile this driver as a module, choose M here:
250 the module will be called processor.
257 This driver enables the ACPI to access the BMC controller. And it
258 uses the IPMI request/response message to communicate with BMC
259 controller, which can be found on on the server.
261 To compile this driver as a module, choose M here:
262 the module will be called as acpi_ipmi.
264 config ACPI_HOTPLUG_CPU
266 depends on ACPI_PROCESSOR && HOTPLUG_CPU
267 select ACPI_CONTAINER
270 config ACPI_PROCESSOR_AGGREGATOR
271 tristate "Processor Aggregator"
272 depends on ACPI_PROCESSOR
275 ACPI 4.0 defines processor Aggregator, which enables OS to perform
276 specific processor configuration and control that applies to all
277 processors in the platform. Currently only logical processor idling
278 is defined, which is to reduce power consumption. This driver
279 supports the new device.
282 tristate "Thermal Zone"
283 depends on ACPI_PROCESSOR
287 This driver supports ACPI thermal zones. Most mobile and
288 some desktop systems support ACPI thermal zones. It is HIGHLY
289 recommended that this option be enabled, as your processor(s)
290 may be damaged without it.
292 To compile this driver as a module, choose M here:
293 the module will be called thermal.
298 depends on (X86 || IA64 || ARM64)
299 default y if IA64_GENERIC || IA64_SGI_SN2 || ARM64
301 config ACPI_CUSTOM_DSDT_FILE
302 string "Custom DSDT Table file to include"
304 depends on !STANDALONE
306 This option supports a custom DSDT by linking it into the kernel.
307 See Documentation/acpi/dsdt-override.txt
309 Enter the full path name to the file which includes the AmlCode
312 If unsure, don't enter a file name.
314 config ACPI_CUSTOM_DSDT
316 default ACPI_CUSTOM_DSDT_FILE != ""
318 config ARCH_HAS_ACPI_TABLE_UPGRADE
321 config ACPI_TABLE_UPGRADE
322 bool "Allow upgrading ACPI tables via initrd"
323 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
326 This option provides functionality to upgrade arbitrary ACPI tables
327 via initrd. No functional change if no ACPI tables are passed via
328 initrd, therefore it's safe to say Y.
329 See Documentation/acpi/initrd_table_override.txt for details
332 bool "Debug Statements"
335 The ACPI subsystem can produce debug output. Saying Y enables this
336 output and increases the kernel size by around 50K.
338 Use the acpi.debug_layer and acpi.debug_level kernel command-line
339 parameters documented in Documentation/acpi/debug.txt and
340 Documentation/kernel-parameters.txt to control the type and
341 amount of debug output.
344 bool "PCI slot detection driver"
348 This driver creates entries in /sys/bus/pci/slots/ for all PCI
349 slots in the system. This can help correlate PCI bus addresses,
350 i.e., segment/bus/device/function tuples, with physical slots in
351 the system. If you are unsure, say N.
354 bool "Power Management Timer Support" if EXPERT
358 The Power Management Timer is available on all ACPI-capable,
359 in most cases even if ACPI is unusable or blacklisted.
361 This timing source is not affected by power management features
362 like aggressive processor idling, throttling, frequency and/or
363 voltage scaling, unlike the commonly used Time Stamp Counter
366 You should nearly always say Y here because many modern
367 systems require this timer.
369 config ACPI_CONTAINER
370 bool "Container and Module Devices"
371 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
373 This driver supports ACPI Container and Module devices (IDs
374 ACPI0004, PNP0A05, and PNP0A06).
376 This helps support hotplug of nodes, CPUs, and memory.
378 To compile this driver as a module, choose M here:
379 the module will be called container.
381 config ACPI_HOTPLUG_MEMORY
382 bool "Memory Hotplug"
383 depends on MEMORY_HOTPLUG
385 This driver supports ACPI memory hotplug. The driver
386 fields notifications on ACPI memory devices (PNP0C80),
387 which represent memory ranges that may be onlined or
388 offlined during runtime.
390 If your hardware and firmware do not support adding or
391 removing memory devices at runtime, you need not enable
394 To compile this driver as a module, choose M here:
395 the module will be called acpi_memhotplug.
397 config ACPI_HOTPLUG_IOAPIC
400 depends on X86_IO_APIC
404 tristate "Smart Battery System"
408 This driver supports the Smart Battery System, another
409 type of access to battery information, found on some laptops.
411 To compile this driver as a module, choose M here:
412 the modules will be called sbs and sbshc.
415 tristate "Hardware Error Device"
417 This driver supports the Hardware Error Device (PNP0C33),
418 which is used to report some hardware errors notified via
419 SCI, mainly the corrected errors.
421 config ACPI_CUSTOM_METHOD
422 tristate "Allow ACPI methods to be inserted/replaced at run time"
426 This debug facility allows ACPI AML methods to be inserted and/or
427 replaced without rebooting the system. For details refer to:
428 Documentation/acpi/method-customizing.txt.
430 NOTE: This option is security sensitive, because it allows arbitrary
431 kernel memory to be written to by root (uid=0) users, allowing them
432 to bypass certain security measures (e.g. if root is not allowed to
433 load additional kernel modules after boot, this feature may be used
434 to override that restriction).
437 bool "Boottime Graphics Resource Table support"
438 depends on EFI && X86
440 This driver adds support for exposing the ACPI Boottime Graphics
441 Resource Table, which allows the operating system to obtain
442 data from the firmware boot splash. It will appear under
443 /sys/firmware/acpi/bgrt/ .
445 config ACPI_REDUCED_HARDWARE_ONLY
446 bool "Hardware-reduced ACPI support only" if EXPERT
449 This config item changes the way the ACPI code is built. When this
450 option is selected, the kernel will use a specialized version of
451 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
452 resulting kernel will be smaller but it will also be restricted to
453 running in ACPI reduced hardware mode ONLY.
455 If you are unsure what to do, do not enable this option.
458 tristate "ACPI NVDIMM Firmware Interface Table (NFIT)"
459 depends on PHYS_ADDR_T_64BIT
461 depends on ARCH_HAS_MMIO_FLUSH
464 Infrastructure to probe ACPI 6 compliant platforms for
465 NVDIMMs (NFIT) and register a libnvdimm device tree. In
466 addition to storage devices this also enables libnvdimm to pass
467 ACPI._DSM messages for platform/dimm configuration.
469 To compile this driver as a module, choose M here:
470 the module will be called nfit.
472 config ACPI_NFIT_DEBUG
473 bool "NFIT DSM debug"
475 depends on DYNAMIC_DEBUG
478 Enabling this option causes the nfit driver to dump the
479 input and output buffers of _DSM operations on the ACPI0012
480 device and its children. This can be very verbose, so leave
481 it disabled unless you are debugging a hardware / firmware
484 source "drivers/acpi/apei/Kconfig"
485 source "drivers/acpi/dptf/Kconfig"
488 tristate "Extended Error Log support"
489 depends on X86_MCE && X86_LOCAL_APIC
494 Certain usages such as Predictive Failure Analysis (PFA) require
495 more information about the error than what can be described in
496 processor machine check banks. Most server processors log
497 additional information about the error in processor uncore
498 registers. Since the addresses and layout of these registers vary
499 widely from one processor to another, system software cannot
500 readily make use of them. To complicate matters further, some of
501 the additional error information cannot be constructed without
502 detailed knowledge about platform topology.
504 Enhanced MCA Logging allows firmware to provide additional error
505 information to system software, synchronous with MCE or CMCI. This
506 driver adds support for that functionality with corresponding
507 tracepoint which carries that information to userspace.
509 menuconfig PMIC_OPREGION
510 bool "PMIC (Power Management Integrated Circuit) operation region support"
512 Select this option to enable support for ACPI operation
513 region of the PMIC chip. The operation region can be used
514 to control power rails and sensor reading/writing on the
518 config CRC_PMIC_OPREGION
519 bool "ACPI operation region support for CrystalCove PMIC"
520 depends on INTEL_SOC_PMIC
522 This config adds ACPI operation region support for CrystalCove PMIC.
524 config XPOWER_PMIC_OPREGION
525 bool "ACPI operation region support for XPower AXP288 PMIC"
526 depends on AXP288_ADC = 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
534 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
539 tristate "ACPI configfs support"
542 Select this option to enable support for ACPI configuration from
543 userspace. The configurable ACPI groups will be visible under
544 /config/acpi, assuming configfs is mounted under /config.