6 bool "ACPI (Advanced Configuration and Power Interface) Support"
7 depends on !IA64_HP_SIM
8 depends on IA64 || X86 || (ARM64 && EXPERT)
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
62 depends on SUSPEND || HIBERNATION
63 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
66 config ACPI_PROCFS_POWER
67 bool "Deprecated power /proc/acpi directories"
68 depends on X86 && PROC_FS
70 For backwards compatibility, this option allows
71 deprecated power /proc/acpi/ directories to exist, even when
72 they have been replaced by functions in /sys.
73 The deprecated directories (and their replacements) include:
74 /proc/acpi/battery/* (/sys/class/power_supply/*)
75 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
76 This option has no effect on /proc/acpi/ directories
77 and functions, which do not yet exist in /sys
78 This option, together with the proc directories, will be
79 deleted in the future.
81 Say N to delete power /proc/acpi/ directories that have moved to /sys/
83 config ACPI_REV_OVERRIDE_POSSIBLE
84 bool "Allow supported ACPI revision to be overriden"
88 The platform firmware on some systems expects Linux to return "5" as
89 the supported ACPI revision which makes it expose system configuration
90 information in a special way.
92 For example, based on what ACPI exports as the supported revision,
93 Dell XPS 13 (2015) configures its audio device to either work in HDA
94 mode or in I2S mode, where the former is supposed to be used on Linux
95 until the latter is fully supported (in the kernel as well as in user
98 This option enables a DMI-based quirk for the above Dell machine (so
99 that HDA audio is exposed by the platform firmware to the kernel) and
100 makes it possible to force the kernel to return "5" as the supported
101 ACPI revision via the "acpi_rev_override" command line switch.
103 config ACPI_EC_DEBUGFS
104 tristate "EC read/write access through /sys/kernel/debug/ec"
107 Say N to disable Embedded Controller /sys/kernel/debug interface
109 Be aware that using this interface can confuse your Embedded
110 Controller in a way that a normal reboot is not enough. You then
111 have to power off your system, and remove the laptop battery for
113 An Embedded Controller typically is available on laptops and reads
114 sensor values like battery state and temperature.
115 The kernel accesses the EC through ACPI parsed code provided by BIOS
116 tables. This option allows to access the EC directly without ACPI
118 Thus this option is a debug option that helps to write ACPI drivers
119 and can be used to identify ACPI code or EC firmware bugs.
122 tristate "AC Adapter"
127 This driver supports the AC Adapter object, which indicates
128 whether a system is on AC or not. If you have a system that can
129 switch between A/C and battery, say Y.
131 To compile this driver as a module, choose M here:
132 the module will be called ac.
140 This driver adds support for battery information through
141 /proc/acpi/battery. If you have a mobile system with a battery,
144 To compile this driver as a module, choose M here:
145 the module will be called battery.
152 This driver handles events on the power, sleep, and lid buttons.
153 A daemon reads events from input devices or via netlink and
154 performs user-defined actions such as shutting down the system.
155 This is necessary for software-controlled poweroff.
157 To compile this driver as a module, choose M here:
158 the module will be called button.
162 depends on X86 && BACKLIGHT_CLASS_DEVICE
166 This driver implements the ACPI Extensions For Display Adapters
167 for integrated graphics devices on motherboard, as specified in
168 ACPI 2.0 Specification, Appendix B. This supports basic operations
169 such as defining the video POST device, retrieving EDID information,
170 and setting up a video output.
172 To compile this driver as a module, choose M here:
173 the module will be called video.
180 This driver supports ACPI fan devices, allowing user-mode
181 applications to perform basic fan control (on, off, status).
183 To compile this driver as a module, choose M here:
184 the module will be called fan.
189 This driver supports ACPI-controlled docking stations and removable
190 drive bays such as the IBM Ultrabay and the Dell Module Bay.
192 config ACPI_CPU_FREQ_PSS
196 config ACPI_PROCESSOR_IDLE
200 config ACPI_PROCESSOR
202 depends on X86 || IA64
203 select ACPI_PROCESSOR_IDLE
204 select ACPI_CPU_FREQ_PSS
207 This driver adds support for the ACPI Processor package. It is required
208 by several flavors of cpufreq performance-state, thermal, throttling and
211 To compile this driver as a module, choose M here:
212 the module will be called processor.
219 This driver enables the ACPI to access the BMC controller. And it
220 uses the IPMI request/response message to communicate with BMC
221 controller, which can be found on on the server.
223 To compile this driver as a module, choose M here:
224 the module will be called as acpi_ipmi.
226 config ACPI_HOTPLUG_CPU
228 depends on ACPI_PROCESSOR && HOTPLUG_CPU
229 select ACPI_CONTAINER
232 config ACPI_PROCESSOR_AGGREGATOR
233 tristate "Processor Aggregator"
234 depends on ACPI_PROCESSOR
237 ACPI 4.0 defines processor Aggregator, which enables OS to perform
238 specific processor configuration and control that applies to all
239 processors in the platform. Currently only logical processor idling
240 is defined, which is to reduce power consumption. This driver
241 supports the new device.
244 tristate "Thermal Zone"
245 depends on ACPI_PROCESSOR
249 This driver supports ACPI thermal zones. Most mobile and
250 some desktop systems support ACPI thermal zones. It is HIGHLY
251 recommended that this option be enabled, as your processor(s)
252 may be damaged without it.
254 To compile this driver as a module, choose M here:
255 the module will be called thermal.
260 depends on (X86 || IA64)
261 default y if IA64_GENERIC || IA64_SGI_SN2
263 config ACPI_CUSTOM_DSDT_FILE
264 string "Custom DSDT Table file to include"
266 depends on !STANDALONE
268 This option supports a custom DSDT by linking it into the kernel.
269 See Documentation/acpi/dsdt-override.txt
271 Enter the full path name to the file which includes the AmlCode
274 If unsure, don't enter a file name.
276 config ACPI_CUSTOM_DSDT
278 default ACPI_CUSTOM_DSDT_FILE != ""
280 config ACPI_INITRD_TABLE_OVERRIDE
281 bool "ACPI tables override via initrd"
282 depends on BLK_DEV_INITRD && X86
285 This option provides functionality to override arbitrary ACPI tables
286 via initrd. No functional change if no ACPI tables are passed via
287 initrd, therefore it's safe to say Y.
288 See Documentation/acpi/initrd_table_override.txt for details
291 bool "Debug Statements"
294 The ACPI subsystem can produce debug output. Saying Y enables this
295 output and increases the kernel size by around 50K.
297 Use the acpi.debug_layer and acpi.debug_level kernel command-line
298 parameters documented in Documentation/acpi/debug.txt and
299 Documentation/kernel-parameters.txt to control the type and
300 amount of debug output.
303 bool "PCI slot detection driver"
307 This driver creates entries in /sys/bus/pci/slots/ for all PCI
308 slots in the system. This can help correlate PCI bus addresses,
309 i.e., segment/bus/device/function tuples, with physical slots in
310 the system. If you are unsure, say N.
313 bool "Power Management Timer Support" if EXPERT
317 The Power Management Timer is available on all ACPI-capable,
318 in most cases even if ACPI is unusable or blacklisted.
320 This timing source is not affected by power management features
321 like aggressive processor idling, throttling, frequency and/or
322 voltage scaling, unlike the commonly used Time Stamp Counter
325 You should nearly always say Y here because many modern
326 systems require this timer.
328 config ACPI_CONTAINER
329 bool "Container and Module Devices"
330 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
332 This driver supports ACPI Container and Module devices (IDs
333 ACPI0004, PNP0A05, and PNP0A06).
335 This helps support hotplug of nodes, CPUs, and memory.
337 To compile this driver as a module, choose M here:
338 the module will be called container.
340 config ACPI_HOTPLUG_MEMORY
341 bool "Memory Hotplug"
342 depends on MEMORY_HOTPLUG
344 This driver supports ACPI memory hotplug. The driver
345 fields notifications on ACPI memory devices (PNP0C80),
346 which represent memory ranges that may be onlined or
347 offlined during runtime.
349 If your hardware and firmware do not support adding or
350 removing memory devices at runtime, you need not enable
353 To compile this driver as a module, choose M here:
354 the module will be called acpi_memhotplug.
356 config ACPI_HOTPLUG_IOAPIC
359 depends on X86_IO_APIC
363 tristate "Smart Battery System"
367 This driver supports the Smart Battery System, another
368 type of access to battery information, found on some laptops.
370 To compile this driver as a module, choose M here:
371 the modules will be called sbs and sbshc.
374 tristate "Hardware Error Device"
376 This driver supports the Hardware Error Device (PNP0C33),
377 which is used to report some hardware errors notified via
378 SCI, mainly the corrected errors.
380 config ACPI_CUSTOM_METHOD
381 tristate "Allow ACPI methods to be inserted/replaced at run time"
385 This debug facility allows ACPI AML methods to be inserted and/or
386 replaced without rebooting the system. For details refer to:
387 Documentation/acpi/method-customizing.txt.
389 NOTE: This option is security sensitive, because it allows arbitrary
390 kernel memory to be written to by root (uid=0) users, allowing them
391 to bypass certain security measures (e.g. if root is not allowed to
392 load additional kernel modules after boot, this feature may be used
393 to override that restriction).
396 bool "Boottime Graphics Resource Table support"
397 depends on EFI && X86
399 This driver adds support for exposing the ACPI Boottime Graphics
400 Resource Table, which allows the operating system to obtain
401 data from the firmware boot splash. It will appear under
402 /sys/firmware/acpi/bgrt/ .
404 config ACPI_REDUCED_HARDWARE_ONLY
405 bool "Hardware-reduced ACPI support only" if EXPERT
408 This config item changes the way the ACPI code is built. When this
409 option is selected, the kernel will use a specialized version of
410 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
411 resulting kernel will be smaller but it will also be restricted to
412 running in ACPI reduced hardware mode ONLY.
414 If you are unsure what to do, do not enable this option.
417 tristate "ACPI NVDIMM Firmware Interface Table (NFIT)"
418 depends on PHYS_ADDR_T_64BIT
422 Infrastructure to probe ACPI 6 compliant platforms for
423 NVDIMMs (NFIT) and register a libnvdimm device tree. In
424 addition to storage devices this also enables libnvdimm to pass
425 ACPI._DSM messages for platform/dimm configuration.
427 To compile this driver as a module, choose M here:
428 the module will be called nfit.
430 config ACPI_NFIT_DEBUG
431 bool "NFIT DSM debug"
433 depends on DYNAMIC_DEBUG
436 Enabling this option causes the nfit driver to dump the
437 input and output buffers of _DSM operations on the ACPI0012
438 device and its children. This can be very verbose, so leave
439 it disabled unless you are debugging a hardware / firmware
442 source "drivers/acpi/apei/Kconfig"
445 tristate "Extended Error Log support"
446 depends on X86_MCE && X86_LOCAL_APIC
451 Certain usages such as Predictive Failure Analysis (PFA) require
452 more information about the error than what can be described in
453 processor machine check banks. Most server processors log
454 additional information about the error in processor uncore
455 registers. Since the addresses and layout of these registers vary
456 widely from one processor to another, system software cannot
457 readily make use of them. To complicate matters further, some of
458 the additional error information cannot be constructed without
459 detailed knowledge about platform topology.
461 Enhanced MCA Logging allows firmware to provide additional error
462 information to system software, synchronous with MCE or CMCI. This
463 driver adds support for that functionality with corresponding
464 tracepoint which carries that information to userspace.
466 menuconfig PMIC_OPREGION
467 bool "PMIC (Power Management Integrated Circuit) operation region support"
469 Select this option to enable support for ACPI operation
470 region of the PMIC chip. The operation region can be used
471 to control power rails and sensor reading/writing on the
475 config CRC_PMIC_OPREGION
476 bool "ACPI operation region support for CrystalCove PMIC"
477 depends on INTEL_SOC_PMIC
479 This config adds ACPI operation region support for CrystalCove PMIC.
481 config XPOWER_PMIC_OPREGION
482 bool "ACPI operation region support for XPower AXP288 PMIC"
483 depends on AXP288_ADC = y
485 This config adds ACPI operation region support for XPower AXP288 PMIC.