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
59 depends on SUSPEND || HIBERNATION
60 depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
63 config ACPI_PROCFS_POWER
64 bool "Deprecated power /proc/acpi directories"
67 For backwards compatibility, this option allows
68 deprecated power /proc/acpi/ directories to exist, even when
69 they have been replaced by functions in /sys.
70 The deprecated directories (and their replacements) include:
71 /proc/acpi/battery/* (/sys/class/power_supply/*)
72 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
73 This option has no effect on /proc/acpi/ directories
74 and functions, which do not yet exist in /sys
75 This option, together with the proc directories, will be
76 deleted in the future.
78 Say N to delete power /proc/acpi/ directories that have moved to /sys/
80 config ACPI_EC_DEBUGFS
81 tristate "EC read/write access through /sys/kernel/debug/ec"
84 Say N to disable Embedded Controller /sys/kernel/debug interface
86 Be aware that using this interface can confuse your Embedded
87 Controller in a way that a normal reboot is not enough. You then
88 have to power off your system, and remove the laptop battery for
90 An Embedded Controller typically is available on laptops and reads
91 sensor values like battery state and temperature.
92 The kernel accesses the EC through ACPI parsed code provided by BIOS
93 tables. This option allows to access the EC directly without ACPI
95 Thus this option is a debug option that helps to write ACPI drivers
96 and can be used to identify ACPI code or EC firmware bugs.
104 This driver supports the AC Adapter object, which indicates
105 whether a system is on AC or not. If you have a system that can
106 switch between A/C and battery, say Y.
108 To compile this driver as a module, choose M here:
109 the module will be called ac.
117 This driver adds support for battery information through
118 /proc/acpi/battery. If you have a mobile system with a battery,
121 To compile this driver as a module, choose M here:
122 the module will be called battery.
129 This driver handles events on the power, sleep, and lid buttons.
130 A daemon reads events from input devices or via netlink and
131 performs user-defined actions such as shutting down the system.
132 This is necessary for software-controlled poweroff.
134 To compile this driver as a module, choose M here:
135 the module will be called button.
139 depends on X86 && BACKLIGHT_CLASS_DEVICE
143 This driver implements the ACPI Extensions For Display Adapters
144 for integrated graphics devices on motherboard, as specified in
145 ACPI 2.0 Specification, Appendix B. This supports basic operations
146 such as defining the video POST device, retrieving EDID information,
147 and setting up a video output.
149 To compile this driver as a module, choose M here:
150 the module will be called video.
157 This driver supports ACPI fan devices, allowing user-mode
158 applications to perform basic fan control (on, off, status).
160 To compile this driver as a module, choose M here:
161 the module will be called fan.
166 This driver supports ACPI-controlled docking stations and removable
167 drive bays such as the IBM Ultrabay and the Dell Module Bay.
169 config ACPI_PROCESSOR
173 depends on X86 || IA64
176 This driver installs ACPI as the idle handler for Linux and uses
177 ACPI C2 and C3 processor states to save power on systems that
178 support it. It is required by several flavors of cpufreq
179 performance-state drivers.
181 To compile this driver as a module, choose M here:
182 the module will be called processor.
189 This driver enables the ACPI to access the BMC controller. And it
190 uses the IPMI request/response message to communicate with BMC
191 controller, which can be found on on the server.
193 To compile this driver as a module, choose M here:
194 the module will be called as acpi_ipmi.
196 config ACPI_HOTPLUG_CPU
198 depends on ACPI_PROCESSOR && HOTPLUG_CPU
199 select ACPI_CONTAINER
202 config ACPI_PROCESSOR_AGGREGATOR
203 tristate "Processor Aggregator"
204 depends on ACPI_PROCESSOR
207 ACPI 4.0 defines processor Aggregator, which enables OS to perform
208 specific processor configuration and control that applies to all
209 processors in the platform. Currently only logical processor idling
210 is defined, which is to reduce power consumption. This driver
211 supports the new device.
214 tristate "Thermal Zone"
215 depends on ACPI_PROCESSOR
219 This driver supports ACPI thermal zones. Most mobile and
220 some desktop systems support ACPI thermal zones. It is HIGHLY
221 recommended that this option be enabled, as your processor(s)
222 may be damaged without it.
224 To compile this driver as a module, choose M here:
225 the module will be called thermal.
230 depends on (X86 || IA64)
231 default y if IA64_GENERIC || IA64_SGI_SN2
233 config ACPI_CUSTOM_DSDT_FILE
234 string "Custom DSDT Table file to include"
236 depends on !STANDALONE
238 This option supports a custom DSDT by linking it into the kernel.
239 See Documentation/acpi/dsdt-override.txt
241 Enter the full path name to the file which includes the AmlCode
244 If unsure, don't enter a file name.
246 config ACPI_CUSTOM_DSDT
248 default ACPI_CUSTOM_DSDT_FILE != ""
250 config ACPI_INITRD_TABLE_OVERRIDE
251 bool "ACPI tables override via initrd"
252 depends on BLK_DEV_INITRD && X86
255 This option provides functionality to override arbitrary ACPI tables
256 via initrd. No functional change if no ACPI tables are passed via
257 initrd, therefore it's safe to say Y.
258 See Documentation/acpi/initrd_table_override.txt for details
261 bool "Debug Statements"
264 The ACPI subsystem can produce debug output. Saying Y enables this
265 output and increases the kernel size by around 50K.
267 Use the acpi.debug_layer and acpi.debug_level kernel command-line
268 parameters documented in Documentation/acpi/debug.txt and
269 Documentation/kernel-parameters.txt to control the type and
270 amount of debug output.
273 bool "PCI slot detection driver"
277 This driver creates entries in /sys/bus/pci/slots/ for all PCI
278 slots in the system. This can help correlate PCI bus addresses,
279 i.e., segment/bus/device/function tuples, with physical slots in
280 the system. If you are unsure, say N.
283 bool "Power Management Timer Support" if EXPERT
287 The Power Management Timer is available on all ACPI-capable,
288 in most cases even if ACPI is unusable or blacklisted.
290 This timing source is not affected by power management features
291 like aggressive processor idling, throttling, frequency and/or
292 voltage scaling, unlike the commonly used Time Stamp Counter
295 You should nearly always say Y here because many modern
296 systems require this timer.
298 config ACPI_CONTAINER
299 bool "Container and Module Devices"
300 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
302 This driver supports ACPI Container and Module devices (IDs
303 ACPI0004, PNP0A05, and PNP0A06).
305 This helps support hotplug of nodes, CPUs, and memory.
307 To compile this driver as a module, choose M here:
308 the module will be called container.
310 config ACPI_HOTPLUG_MEMORY
311 bool "Memory Hotplug"
312 depends on MEMORY_HOTPLUG
314 This driver supports ACPI memory hotplug. The driver
315 fields notifications on ACPI memory devices (PNP0C80),
316 which represent memory ranges that may be onlined or
317 offlined during runtime.
319 If your hardware and firmware do not support adding or
320 removing memory devices at runtime, you need not enable
323 To compile this driver as a module, choose M here:
324 the module will be called acpi_memhotplug.
326 config ACPI_HOTPLUG_IOAPIC
329 depends on X86_IO_APIC
333 tristate "Smart Battery System"
337 This driver supports the Smart Battery System, another
338 type of access to battery information, found on some laptops.
340 To compile this driver as a module, choose M here:
341 the modules will be called sbs and sbshc.
344 tristate "Hardware Error Device"
346 This driver supports the Hardware Error Device (PNP0C33),
347 which is used to report some hardware errors notified via
348 SCI, mainly the corrected errors.
350 config ACPI_CUSTOM_METHOD
351 tristate "Allow ACPI methods to be inserted/replaced at run time"
355 This debug facility allows ACPI AML methods to be inserted and/or
356 replaced without rebooting the system. For details refer to:
357 Documentation/acpi/method-customizing.txt.
359 NOTE: This option is security sensitive, because it allows arbitrary
360 kernel memory to be written to by root (uid=0) users, allowing them
361 to bypass certain security measures (e.g. if root is not allowed to
362 load additional kernel modules after boot, this feature may be used
363 to override that restriction).
366 bool "Boottime Graphics Resource Table support"
367 depends on EFI && X86
369 This driver adds support for exposing the ACPI Boottime Graphics
370 Resource Table, which allows the operating system to obtain
371 data from the firmware boot splash. It will appear under
372 /sys/firmware/acpi/bgrt/ .
374 config ACPI_REDUCED_HARDWARE_ONLY
375 bool "Hardware-reduced ACPI support only" if EXPERT
378 This config item changes the way the ACPI code is built. When this
379 option is selected, the kernel will use a specialized version of
380 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
381 resulting kernel will be smaller but it will also be restricted to
382 running in ACPI reduced hardware mode ONLY.
384 If you are unsure what to do, do not enable this option.
386 source "drivers/acpi/apei/Kconfig"
389 tristate "Extended Error Log support"
390 depends on X86_MCE && X86_LOCAL_APIC
395 Certain usages such as Predictive Failure Analysis (PFA) require
396 more information about the error than what can be described in
397 processor machine check banks. Most server processors log
398 additional information about the error in processor uncore
399 registers. Since the addresses and layout of these registers vary
400 widely from one processor to another, system software cannot
401 readily make use of them. To complicate matters further, some of
402 the additional error information cannot be constructed without
403 detailed knowledge about platform topology.
405 Enhanced MCA Logging allows firmware to provide additional error
406 information to system software, synchronous with MCE or CMCI. This
407 driver adds support for that functionality with corresponding
408 tracepoint which carries that information to userspace.
410 menuconfig PMIC_OPREGION
411 bool "PMIC (Power Management Integrated Circuit) operation region support"
413 Select this option to enable support for ACPI operation
414 region of the PMIC chip. The operation region can be used
415 to control power rails and sensor reading/writing on the
419 config CRC_PMIC_OPREGION
420 bool "ACPI operation region support for CrystalCove PMIC"
421 depends on INTEL_SOC_PMIC
423 This config adds ACPI operation region support for CrystalCove PMIC.
425 config XPOWER_PMIC_OPREGION
426 bool "ACPI operation region support for XPower AXP288 PMIC"
427 depends on AXP288_ADC = y
429 This config adds ACPI operation region support for XPower AXP288 PMIC.