6 bool "ACPI (Advanced Configuration and Power Interface) Support"
7 depends on !IA64_HP_SIM
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>
47 depends on SUSPEND || HIBERNATION
50 config ACPI_EC_DEBUGFS
51 tristate "EC read/write access through /sys/kernel/debug/ec"
54 Say N to disable Embedded Controller /sys/kernel/debug interface
56 Be aware that using this interface can confuse your Embedded
57 Controller in a way that a normal reboot is not enough. You then
58 have to power off your system, and remove the laptop battery for
60 An Embedded Controller typically is available on laptops and reads
61 sensor values like battery state and temperature.
62 The kernel accesses the EC through ACPI parsed code provided by BIOS
63 tables. This option allows to access the EC directly without ACPI
65 Thus this option is a debug option that helps to write ACPI drivers
66 and can be used to identify ACPI code or EC firmware bugs.
74 This driver supports the AC Adapter object, which indicates
75 whether a system is on AC or not. If you have a system that can
76 switch between A/C and battery, say Y.
78 To compile this driver as a module, choose M here:
79 the module will be called ac.
87 This driver adds support for battery information through
88 /proc/acpi/battery. If you have a mobile system with a battery,
91 To compile this driver as a module, choose M here:
92 the module will be called battery.
99 This driver handles events on the power, sleep, and lid buttons.
100 A daemon reads events from input devices or via netlink and
101 performs user-defined actions such as shutting down the system.
102 This is necessary for software-controlled poweroff.
104 To compile this driver as a module, choose M here:
105 the module will be called button.
109 depends on X86 && BACKLIGHT_CLASS_DEVICE
113 This driver implements the ACPI Extensions For Display Adapters
114 for integrated graphics devices on motherboard, as specified in
115 ACPI 2.0 Specification, Appendix B. This supports basic operations
116 such as defining the video POST device, retrieving EDID information,
117 and setting up a video output.
119 To compile this driver as a module, choose M here:
120 the module will be called video.
127 This driver supports ACPI fan devices, allowing user-mode
128 applications to perform basic fan control (on, off, status).
130 To compile this driver as a module, choose M here:
131 the module will be called fan.
136 This driver supports ACPI-controlled docking stations and removable
137 drive bays such as the IBM Ultrabay and the Dell Module Bay.
139 config ACPI_PROCESSOR
145 This driver installs ACPI as the idle handler for Linux and uses
146 ACPI C2 and C3 processor states to save power on systems that
147 support it. It is required by several flavors of cpufreq
148 performance-state drivers.
150 To compile this driver as a module, choose M here:
151 the module will be called processor.
158 This driver enables the ACPI to access the BMC controller. And it
159 uses the IPMI request/response message to communicate with BMC
160 controller, which can be found on on the server.
162 To compile this driver as a module, choose M here:
163 the module will be called as acpi_ipmi.
165 config ACPI_HOTPLUG_CPU
167 depends on ACPI_PROCESSOR && HOTPLUG_CPU
168 select ACPI_CONTAINER
171 config ACPI_PROCESSOR_AGGREGATOR
172 tristate "Processor Aggregator"
173 depends on ACPI_PROCESSOR
176 ACPI 4.0 defines processor Aggregator, which enables OS to perform
177 specific processor configuration and control that applies to all
178 processors in the platform. Currently only logical processor idling
179 is defined, which is to reduce power consumption. This driver
180 supports the new device.
183 tristate "Thermal Zone"
184 depends on ACPI_PROCESSOR
188 This driver supports ACPI thermal zones. Most mobile and
189 some desktop systems support ACPI thermal zones. It is HIGHLY
190 recommended that this option be enabled, as your processor(s)
191 may be damaged without it.
193 To compile this driver as a module, choose M here:
194 the module will be called thermal.
199 depends on (X86 || IA64)
200 default y if IA64_GENERIC || IA64_SGI_SN2
202 config ACPI_CUSTOM_DSDT_FILE
203 string "Custom DSDT Table file to include"
205 depends on !STANDALONE
207 This option supports a custom DSDT by linking it into the kernel.
208 See Documentation/acpi/dsdt-override.txt
210 Enter the full path name to the file which includes the AmlCode
213 If unsure, don't enter a file name.
215 config ACPI_CUSTOM_DSDT
217 default ACPI_CUSTOM_DSDT_FILE != ""
219 config ACPI_INITRD_TABLE_OVERRIDE
220 bool "ACPI tables override via initrd"
221 depends on BLK_DEV_INITRD && X86
224 This option provides functionality to override arbitrary ACPI tables
225 via initrd. No functional change if no ACPI tables are passed via
226 initrd, therefore it's safe to say Y.
227 See Documentation/acpi/initrd_table_override.txt for details
230 bool "Debug Statements"
233 The ACPI subsystem can produce debug output. Saying Y enables this
234 output and increases the kernel size by around 50K.
236 Use the acpi.debug_layer and acpi.debug_level kernel command-line
237 parameters documented in Documentation/acpi/debug.txt and
238 Documentation/kernel-parameters.txt to control the type and
239 amount of debug output.
242 bool "PCI slot detection driver"
246 This driver creates entries in /sys/bus/pci/slots/ for all PCI
247 slots in the system. This can help correlate PCI bus addresses,
248 i.e., segment/bus/device/function tuples, with physical slots in
249 the system. If you are unsure, say N.
252 bool "Power Management Timer Support" if EXPERT
256 The Power Management Timer is available on all ACPI-capable,
257 in most cases even if ACPI is unusable or blacklisted.
259 This timing source is not affected by power management features
260 like aggressive processor idling, throttling, frequency and/or
261 voltage scaling, unlike the commonly used Time Stamp Counter
264 You should nearly always say Y here because many modern
265 systems require this timer.
267 config ACPI_CONTAINER
268 bool "Container and Module Devices"
269 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
271 This driver supports ACPI Container and Module devices (IDs
272 ACPI0004, PNP0A05, and PNP0A06).
274 This helps support hotplug of nodes, CPUs, and memory.
276 To compile this driver as a module, choose M here:
277 the module will be called container.
279 config ACPI_HOTPLUG_MEMORY
280 bool "Memory Hotplug"
281 depends on MEMORY_HOTPLUG
283 This driver supports ACPI memory hotplug. The driver
284 fields notifications on ACPI memory devices (PNP0C80),
285 which represent memory ranges that may be onlined or
286 offlined during runtime.
288 If your hardware and firmware do not support adding or
289 removing memory devices at runtime, you need not enable
292 To compile this driver as a module, choose M here:
293 the module will be called acpi_memhotplug.
296 tristate "Smart Battery System"
300 This driver supports the Smart Battery System, another
301 type of access to battery information, found on some laptops.
303 To compile this driver as a module, choose M here:
304 the modules will be called sbs and sbshc.
307 tristate "Hardware Error Device"
309 This driver supports the Hardware Error Device (PNP0C33),
310 which is used to report some hardware errors notified via
311 SCI, mainly the corrected errors.
313 config ACPI_CUSTOM_METHOD
314 tristate "Allow ACPI methods to be inserted/replaced at run time"
318 This debug facility allows ACPI AML methods to be inserted and/or
319 replaced without rebooting the system. For details refer to:
320 Documentation/acpi/method-customizing.txt.
322 NOTE: This option is security sensitive, because it allows arbitrary
323 kernel memory to be written to by root (uid=0) users, allowing them
324 to bypass certain security measures (e.g. if root is not allowed to
325 load additional kernel modules after boot, this feature may be used
326 to override that restriction).
329 bool "Boottime Graphics Resource Table support"
330 depends on EFI && X86
332 This driver adds support for exposing the ACPI Boottime Graphics
333 Resource Table, which allows the operating system to obtain
334 data from the firmware boot splash. It will appear under
335 /sys/firmware/acpi/bgrt/ .
337 config ACPI_REDUCED_HARDWARE_ONLY
338 bool "Hardware-reduced ACPI support only" if EXPERT
342 This config item changes the way the ACPI code is built. When this
343 option is selected, the kernel will use a specialized version of
344 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The
345 resulting kernel will be smaller but it will also be restricted to
346 running in ACPI reduced hardware mode ONLY.
348 If you are unsure what to do, do not enable this option.
350 source "drivers/acpi/apei/Kconfig"
353 tristate "Extended Error Log support"
354 depends on X86_MCE && X86_LOCAL_APIC
358 Certain usages such as Predictive Failure Analysis (PFA) require
359 more information about the error than what can be described in
360 processor machine check banks. Most server processors log
361 additional information about the error in processor uncore
362 registers. Since the addresses and layout of these registers vary
363 widely from one processor to another, system software cannot
364 readily make use of them. To complicate matters further, some of
365 the additional error information cannot be constructed without
366 detailed knowledge about platform topology.
368 Enhanced MCA Logging allows firmware to provide additional error
369 information to system software, synchronous with MCE or CMCI. This
370 driver adds support for that functionality.