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92 they have been replaced by functions in /sys.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
229 depends on ACPI_PROCESSOR
230 depends on !ACPI_CPU_FREQ_PSS
234 If this option is enabled, this file implements common functionality
235 to parse CPPC tables as described in the ACPI 5.1+ spec. The
236 routines implemented are meant to be used by other
237 drivers to control CPU performance using CPPC semantics.
238 If your platform does not support CPPC in firmware,
239 leave this option disabled.
241 config ACPI_PROCESSOR
243 depends on X86 || IA64 || ARM64
244 select ACPI_PROCESSOR_IDLE
245 select ACPI_CPU_FREQ_PSS if X86 || IA64
248 This driver adds support for the ACPI Processor package. It is required
249 by several flavors of cpufreq performance-state, thermal, throttling and
252 To compile this driver as a module, choose M here:
253 the module will be called processor.
260 This driver enables the ACPI to access the BMC controller. And it
261 uses the IPMI request/response message to communicate with BMC
262 controller, which can be found on on the server.
264 To compile this driver as a module, choose M here:
265 the module will be called as acpi_ipmi.
267 config ACPI_HOTPLUG_CPU
269 depends on ACPI_PROCESSOR && HOTPLUG_CPU
270 select ACPI_CONTAINER
273 config ACPI_PROCESSOR_AGGREGATOR
274 tristate "Processor Aggregator"
275 depends on ACPI_PROCESSOR
278 ACPI 4.0 defines processor Aggregator, which enables OS to perform
279 specific processor configuration and control that applies to all
280 processors in the platform. Currently only logical processor idling
281 is defined, which is to reduce power consumption. This driver
282 supports the new device.
285 tristate "Thermal Zone"
286 depends on ACPI_PROCESSOR
290 This driver supports ACPI thermal zones. Most mobile and
291 some desktop systems support ACPI thermal zones. It is HIGHLY
292 recommended that this option be enabled, as your processor(s)
293 may be damaged without it.
295 To compile this driver as a module, choose M here:
296 the module will be called thermal.
301 depends on (X86 || IA64 || ARM64)
302 default y if IA64_GENERIC || IA64_SGI_SN2 || ARM64
304 config ACPI_CUSTOM_DSDT_FILE
305 string "Custom DSDT Table file to include"
307 depends on !STANDALONE
309 This option supports a custom DSDT by linking it into the kernel.
310 See Documentation/acpi/dsdt-override.txt
312 Enter the full path name to the file which includes the AmlCode
315 If unsure, don't enter a file name.
317 config ACPI_CUSTOM_DSDT
319 default ACPI_CUSTOM_DSDT_FILE != ""
321 config ARCH_HAS_ACPI_TABLE_UPGRADE
324 config ACPI_TABLE_UPGRADE
325 bool "Allow upgrading ACPI tables via initrd"
326 depends on BLK_DEV_INITRD && ARCH_HAS_ACPI_TABLE_UPGRADE
329 This option provides functionality to upgrade arbitrary ACPI tables
330 via initrd. No functional change if no ACPI tables are passed via
331 initrd, therefore it's safe to say Y.
332 See Documentation/acpi/initrd_table_override.txt for details
335 bool "Debug Statements"
338 The ACPI subsystem can produce debug output. Saying Y enables this
339 output and increases the kernel size by around 50K.
341 Use the acpi.debug_layer and acpi.debug_level kernel command-line
342 parameters documented in Documentation/acpi/debug.txt and
343 Documentation/kernel-parameters.txt to control the type and
344 amount of debug output.
347 bool "PCI slot detection driver"
351 This driver creates entries in /sys/bus/pci/slots/ for all PCI
352 slots in the system. This can help correlate PCI bus addresses,
353 i.e., segment/bus/device/function tuples, with physical slots in
354 the system. If you are unsure, say N.
357 bool "Power Management Timer Support" if EXPERT
361 The Power Management Timer is available on all ACPI-capable,
362 in most cases even if ACPI is unusable or blacklisted.
364 This timing source is not affected by power management features
365 like aggressive processor idling, throttling, frequency and/or
366 voltage scaling, unlike the commonly used Time Stamp Counter
369 You should nearly always say Y here because many modern
370 systems require this timer.
372 config ACPI_CONTAINER
373 bool "Container and Module Devices"
374 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
376 This driver supports ACPI Container and Module devices (IDs
377 ACPI0004, PNP0A05, and PNP0A06).
379 This helps support hotplug of nodes, CPUs, and memory.
381 To compile this driver as a module, choose M here:
382 the module will be called container.
384 config ACPI_HOTPLUG_MEMORY
385 bool "Memory Hotplug"
386 depends on MEMORY_HOTPLUG
388 This driver supports ACPI memory hotplug. The driver
389 fields notifications on ACPI memory devices (PNP0C80),
390 which represent memory ranges that may be onlined or
391 offlined during runtime.
393 If your hardware and firmware do not support adding or
394 removing memory devices at runtime, you need not enable
397 To compile this driver as a module, choose M here:
398 the module will be called acpi_memhotplug.
400 config ACPI_HOTPLUG_IOAPIC
403 depends on X86_IO_APIC
407 tristate "Smart Battery System"
411 This driver supports the Smart Battery System, another
412 type of access to battery information, found on some laptops.
414 To compile this driver as a module, choose M here:
415 the modules will be called sbs and sbshc.
418 tristate "Hardware Error Device"
420 This driver supports the Hardware Error Device (PNP0C33),
421 which is used to report some hardware errors notified via
422 SCI, mainly the corrected errors.
424 config ACPI_CUSTOM_METHOD
425 tristate "Allow ACPI methods to be inserted/replaced at run time"
429 This debug facility allows ACPI AML methods to be inserted and/or
430 replaced without rebooting the system. For details refer to:
431 Documentation/acpi/method-customizing.txt.
433 NOTE: This option is security sensitive, because it allows arbitrary
434 kernel memory to be written to by root (uid=0) users, allowing them
435 to bypass certain security measures (e.g. if root is not allowed to
436 load additional kernel modules after boot, this feature may be used
437 to override that restriction).
440 bool "Boottime Graphics Resource Table support"
441 depends on EFI && X86
443 This driver adds support for exposing the ACPI Boottime Graphics
444 Resource Table, which allows the operating system to obtain
445 data from the firmware boot splash. It will appear under
446 /sys/firmware/acpi/bgrt/ .
448 config ACPI_REDUCED_HARDWARE_ONLY
449 bool "Hardware-reduced ACPI support only" if EXPERT
452 This config item changes the way the ACPI code is built. When this
453 option is selected, the kernel will use a specialized version of
454 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
455 resulting kernel will be smaller but it will also be restricted to
456 running in ACPI reduced hardware mode ONLY.
458 If you are unsure what to do, do not enable this option.
460 source "drivers/acpi/nfit/Kconfig"
462 source "drivers/acpi/apei/Kconfig"
463 source "drivers/acpi/dptf/Kconfig"
466 tristate "Extended Error Log support"
467 depends on X86_MCE && X86_LOCAL_APIC
472 Certain usages such as Predictive Failure Analysis (PFA) require
473 more information about the error than what can be described in
474 processor machine check banks. Most server processors log
475 additional information about the error in processor uncore
476 registers. Since the addresses and layout of these registers vary
477 widely from one processor to another, system software cannot
478 readily make use of them. To complicate matters further, some of
479 the additional error information cannot be constructed without
480 detailed knowledge about platform topology.
482 Enhanced MCA Logging allows firmware to provide additional error
483 information to system software, synchronous with MCE or CMCI. This
484 driver adds support for that functionality with corresponding
485 tracepoint which carries that information to userspace.
487 menuconfig PMIC_OPREGION
488 bool "PMIC (Power Management Integrated Circuit) operation region support"
490 Select this option to enable support for ACPI operation
491 region of the PMIC chip. The operation region can be used
492 to control power rails and sensor reading/writing on the
496 config CRC_PMIC_OPREGION
497 bool "ACPI operation region support for CrystalCove PMIC"
498 depends on INTEL_SOC_PMIC
500 This config adds ACPI operation region support for CrystalCove PMIC.
502 config XPOWER_PMIC_OPREGION
503 bool "ACPI operation region support for XPower AXP288 PMIC"
504 depends on AXP288_ADC = y
506 This config adds ACPI operation region support for XPower AXP288 PMIC.
508 config BXT_WC_PMIC_OPREGION
509 bool "ACPI operation region support for BXT WhiskeyCove PMIC"
510 depends on INTEL_SOC_PMIC
512 This config adds ACPI operation region support for BXT WhiskeyCove PMIC.
517 tristate "ACPI configfs support"
520 Select this option to enable support for ACPI configuration from
521 userspace. The configurable ACPI groups will be visible under
522 /config/acpi, assuming configfs is mounted under /config.