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72 they have been replaced by functions in /sys.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_EC_DEBUGFS
84 tristate "EC read/write access through /sys/kernel/debug/ec"
87 Say N to disable Embedded Controller /sys/kernel/debug interface
89 Be aware that using this interface can confuse your Embedded
90 Controller in a way that a normal reboot is not enough. You then
91 have to power off your system, and remove the laptop battery for
93 An Embedded Controller typically is available on laptops and reads
94 sensor values like battery state and temperature.
95 The kernel accesses the EC through ACPI parsed code provided by BIOS
96 tables. This option allows to access the EC directly without ACPI
98 Thus this option is a debug option that helps to write ACPI drivers
99 and can be used to identify ACPI code or EC firmware bugs.
102 tristate "AC Adapter"
107 This driver supports the AC Adapter object, which indicates
108 whether a system is on AC or not. If you have a system that can
109 switch between A/C and battery, say Y.
111 To compile this driver as a module, choose M here:
112 the module will be called ac.
120 This driver adds support for battery information through
121 /proc/acpi/battery. If you have a mobile system with a battery,
124 To compile this driver as a module, choose M here:
125 the module will be called battery.
132 This driver handles events on the power, sleep, and lid buttons.
133 A daemon reads events from input devices or via netlink and
134 performs user-defined actions such as shutting down the system.
135 This is necessary for software-controlled poweroff.
137 To compile this driver as a module, choose M here:
138 the module will be called button.
142 depends on X86 && BACKLIGHT_CLASS_DEVICE
146 This driver implements the ACPI Extensions For Display Adapters
147 for integrated graphics devices on motherboard, as specified in
148 ACPI 2.0 Specification, Appendix B. This supports basic operations
149 such as defining the video POST device, retrieving EDID information,
150 and setting up a video output.
152 To compile this driver as a module, choose M here:
153 the module will be called video.
160 This driver supports ACPI fan devices, allowing user-mode
161 applications to perform basic fan control (on, off, status).
163 To compile this driver as a module, choose M here:
164 the module will be called fan.
169 This driver supports ACPI-controlled docking stations and removable
170 drive bays such as the IBM Ultrabay and the Dell Module Bay.
172 config ACPI_PROCESSOR
176 depends on X86 || IA64
179 This driver installs ACPI as the idle handler for Linux and uses
180 ACPI C2 and C3 processor states to save power on systems that
181 support it. It is required by several flavors of cpufreq
182 performance-state drivers.
184 To compile this driver as a module, choose M here:
185 the module will be called processor.
192 This driver enables the ACPI to access the BMC controller. And it
193 uses the IPMI request/response message to communicate with BMC
194 controller, which can be found on on the server.
196 To compile this driver as a module, choose M here:
197 the module will be called as acpi_ipmi.
199 config ACPI_HOTPLUG_CPU
201 depends on ACPI_PROCESSOR && HOTPLUG_CPU
202 select ACPI_CONTAINER
205 config ACPI_PROCESSOR_AGGREGATOR
206 tristate "Processor Aggregator"
207 depends on ACPI_PROCESSOR
210 ACPI 4.0 defines processor Aggregator, which enables OS to perform
211 specific processor configuration and control that applies to all
212 processors in the platform. Currently only logical processor idling
213 is defined, which is to reduce power consumption. This driver
214 supports the new device.
217 tristate "Thermal Zone"
218 depends on ACPI_PROCESSOR
222 This driver supports ACPI thermal zones. Most mobile and
223 some desktop systems support ACPI thermal zones. It is HIGHLY
224 recommended that this option be enabled, as your processor(s)
225 may be damaged without it.
227 To compile this driver as a module, choose M here:
228 the module will be called thermal.
233 depends on (X86 || IA64)
234 default y if IA64_GENERIC || IA64_SGI_SN2
236 config ACPI_CUSTOM_DSDT_FILE
237 string "Custom DSDT Table file to include"
239 depends on !STANDALONE
241 This option supports a custom DSDT by linking it into the kernel.
242 See Documentation/acpi/dsdt-override.txt
244 Enter the full path name to the file which includes the AmlCode
247 If unsure, don't enter a file name.
249 config ACPI_CUSTOM_DSDT
251 default ACPI_CUSTOM_DSDT_FILE != ""
253 config ACPI_INITRD_TABLE_OVERRIDE
254 bool "ACPI tables override via initrd"
255 depends on BLK_DEV_INITRD && X86
258 This option provides functionality to override arbitrary ACPI tables
259 via initrd. No functional change if no ACPI tables are passed via
260 initrd, therefore it's safe to say Y.
261 See Documentation/acpi/initrd_table_override.txt for details
264 bool "Debug Statements"
267 The ACPI subsystem can produce debug output. Saying Y enables this
268 output and increases the kernel size by around 50K.
270 Use the acpi.debug_layer and acpi.debug_level kernel command-line
271 parameters documented in Documentation/acpi/debug.txt and
272 Documentation/kernel-parameters.txt to control the type and
273 amount of debug output.
276 bool "PCI slot detection driver"
280 This driver creates entries in /sys/bus/pci/slots/ for all PCI
281 slots in the system. This can help correlate PCI bus addresses,
282 i.e., segment/bus/device/function tuples, with physical slots in
283 the system. If you are unsure, say N.
286 bool "Power Management Timer Support" if EXPERT
290 The Power Management Timer is available on all ACPI-capable,
291 in most cases even if ACPI is unusable or blacklisted.
293 This timing source is not affected by power management features
294 like aggressive processor idling, throttling, frequency and/or
295 voltage scaling, unlike the commonly used Time Stamp Counter
298 You should nearly always say Y here because many modern
299 systems require this timer.
301 config ACPI_CONTAINER
302 bool "Container and Module Devices"
303 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
305 This driver supports ACPI Container and Module devices (IDs
306 ACPI0004, PNP0A05, and PNP0A06).
308 This helps support hotplug of nodes, CPUs, and memory.
310 To compile this driver as a module, choose M here:
311 the module will be called container.
313 config ACPI_HOTPLUG_MEMORY
314 bool "Memory Hotplug"
315 depends on MEMORY_HOTPLUG
317 This driver supports ACPI memory hotplug. The driver
318 fields notifications on ACPI memory devices (PNP0C80),
319 which represent memory ranges that may be onlined or
320 offlined during runtime.
322 If your hardware and firmware do not support adding or
323 removing memory devices at runtime, you need not enable
326 To compile this driver as a module, choose M here:
327 the module will be called acpi_memhotplug.
329 config ACPI_HOTPLUG_IOAPIC
332 depends on X86_IO_APIC
336 tristate "Smart Battery System"
340 This driver supports the Smart Battery System, another
341 type of access to battery information, found on some laptops.
343 To compile this driver as a module, choose M here:
344 the modules will be called sbs and sbshc.
347 tristate "Hardware Error Device"
349 This driver supports the Hardware Error Device (PNP0C33),
350 which is used to report some hardware errors notified via
351 SCI, mainly the corrected errors.
353 config ACPI_CUSTOM_METHOD
354 tristate "Allow ACPI methods to be inserted/replaced at run time"
358 This debug facility allows ACPI AML methods to be inserted and/or
359 replaced without rebooting the system. For details refer to:
360 Documentation/acpi/method-customizing.txt.
362 NOTE: This option is security sensitive, because it allows arbitrary
363 kernel memory to be written to by root (uid=0) users, allowing them
364 to bypass certain security measures (e.g. if root is not allowed to
365 load additional kernel modules after boot, this feature may be used
366 to override that restriction).
369 bool "Boottime Graphics Resource Table support"
370 depends on EFI && X86
372 This driver adds support for exposing the ACPI Boottime Graphics
373 Resource Table, which allows the operating system to obtain
374 data from the firmware boot splash. It will appear under
375 /sys/firmware/acpi/bgrt/ .
377 config ACPI_REDUCED_HARDWARE_ONLY
378 bool "Hardware-reduced ACPI support only" if EXPERT
381 This config item changes the way the ACPI code is built. When this
382 option is selected, the kernel will use a specialized version of
383 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
384 resulting kernel will be smaller but it will also be restricted to
385 running in ACPI reduced hardware mode ONLY.
387 If you are unsure what to do, do not enable this option.
389 source "drivers/acpi/apei/Kconfig"
392 tristate "Extended Error Log support"
393 depends on X86_MCE && X86_LOCAL_APIC
398 Certain usages such as Predictive Failure Analysis (PFA) require
399 more information about the error than what can be described in
400 processor machine check banks. Most server processors log
401 additional information about the error in processor uncore
402 registers. Since the addresses and layout of these registers vary
403 widely from one processor to another, system software cannot
404 readily make use of them. To complicate matters further, some of
405 the additional error information cannot be constructed without
406 detailed knowledge about platform topology.
408 Enhanced MCA Logging allows firmware to provide additional error
409 information to system software, synchronous with MCE or CMCI. This
410 driver adds support for that functionality with corresponding
411 tracepoint which carries that information to userspace.
413 menuconfig PMIC_OPREGION
414 bool "PMIC (Power Management Integrated Circuit) operation region support"
416 Select this option to enable support for ACPI operation
417 region of the PMIC chip. The operation region can be used
418 to control power rails and sensor reading/writing on the
422 config CRC_PMIC_OPREGION
423 bool "ACPI operation region support for CrystalCove PMIC"
424 depends on INTEL_SOC_PMIC
426 This config adds ACPI operation region support for CrystalCove PMIC.
428 config XPOWER_PMIC_OPREGION
429 bool "ACPI operation region support for XPower AXP288 PMIC"
430 depends on AXP288_ADC = y
432 This config adds ACPI operation region support for XPower AXP288 PMIC.