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 co-developed by
35 Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba.
36 The specification is available at:
37 <http://www.acpi.info>
43 depends on SUSPEND || HIBERNATION
47 bool "Deprecated /proc/acpi files"
50 For backwards compatibility, this option allows
51 deprecated /proc/acpi/ files to exist, even when
52 they have been replaced by functions in /sys.
54 This option has no effect on /proc/acpi/ files
55 and functions which do not yet exist in /sys.
57 Say N to delete /proc/acpi/ files that have moved to /sys/
59 config ACPI_EC_DEBUGFS
60 tristate "EC read/write access through /sys/kernel/debug/ec"
63 Say N to disable Embedded Controller /sys/kernel/debug interface
65 Be aware that using this interface can confuse your Embedded
66 Controller in a way that a normal reboot is not enough. You then
67 have to power off your system, and remove the laptop battery for
69 An Embedded Controller typically is available on laptops and reads
70 sensor values like battery state and temperature.
71 The kernel accesses the EC through ACPI parsed code provided by BIOS
72 tables. This option allows to access the EC directly without ACPI
74 Thus this option is a debug option that helps to write ACPI drivers
75 and can be used to identify ACPI code or EC firmware bugs.
83 This driver supports the AC Adapter object, which indicates
84 whether a system is on AC or not. If you have a system that can
85 switch between A/C and battery, say Y.
87 To compile this driver as a module, choose M here:
88 the module will be called ac.
96 This driver adds support for battery information through
97 /proc/acpi/battery. If you have a mobile system with a battery,
100 To compile this driver as a module, choose M here:
101 the module will be called battery.
108 This driver handles events on the power, sleep, and lid buttons.
109 A daemon reads events from input devices or via netlink and
110 performs user-defined actions such as shutting down the system.
111 This is necessary for software-controlled poweroff.
113 To compile this driver as a module, choose M here:
114 the module will be called button.
118 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
122 This driver implements the ACPI Extensions For Display Adapters
123 for integrated graphics devices on motherboard, as specified in
124 ACPI 2.0 Specification, Appendix B. This supports basic operations
125 such as defining the video POST device, retrieving EDID information,
126 and setting up a video output.
128 To compile this driver as a module, choose M here:
129 the module will be called video.
136 This driver supports ACPI fan devices, allowing user-mode
137 applications to perform basic fan control (on, off, status).
139 To compile this driver as a module, choose M here:
140 the module will be called fan.
145 This driver supports ACPI-controlled docking stations and removable
146 drive bays such as the IBM Ultrabay and the Dell Module Bay.
148 config ACPI_PROCESSOR
154 This driver installs ACPI as the idle handler for Linux and uses
155 ACPI C2 and C3 processor states to save power on systems that
156 support it. It is required by several flavors of cpufreq
157 performance-state drivers.
159 To compile this driver as a module, choose M here:
160 the module will be called processor.
163 depends on IPMI_SI && IPMI_HANDLER
166 This driver enables the ACPI to access the BMC controller. And it
167 uses the IPMI request/response message to communicate with BMC
168 controller, which can be found on on the server.
170 To compile this driver as a module, choose M here:
171 the module will be called as acpi_ipmi.
173 config ACPI_HOTPLUG_CPU
175 depends on ACPI_PROCESSOR && HOTPLUG_CPU
176 select ACPI_CONTAINER
179 config ACPI_PROCESSOR_AGGREGATOR
180 tristate "Processor Aggregator"
181 depends on ACPI_PROCESSOR
184 ACPI 4.0 defines processor Aggregator, which enables OS to perform
185 specific processor configuration and control that applies to all
186 processors in the platform. Currently only logical processor idling
187 is defined, which is to reduce power consumption. This driver
188 supports the new device.
191 tristate "Thermal Zone"
192 depends on ACPI_PROCESSOR
196 This driver supports ACPI thermal zones. Most mobile and
197 some desktop systems support ACPI thermal zones. It is HIGHLY
198 recommended that this option be enabled, as your processor(s)
199 may be damaged without it.
201 To compile this driver as a module, choose M here:
202 the module will be called thermal.
207 depends on (X86 || IA64)
208 default y if IA64_GENERIC || IA64_SGI_SN2
210 config ACPI_CUSTOM_DSDT_FILE
211 string "Custom DSDT Table file to include"
213 depends on !STANDALONE
215 This option supports a custom DSDT by linking it into the kernel.
216 See Documentation/acpi/dsdt-override.txt
218 Enter the full path name to the file which includes the AmlCode
221 If unsure, don't enter a file name.
223 config ACPI_CUSTOM_DSDT
225 default ACPI_CUSTOM_DSDT_FILE != ""
227 config ACPI_INITRD_TABLE_OVERRIDE
228 bool "ACPI tables override via initrd"
229 depends on BLK_DEV_INITRD && X86
232 This option provides functionality to override arbitrary ACPI tables
233 via initrd. No functional change if no ACPI tables are passed via
234 initrd, therefore it's safe to say Y.
235 See Documentation/acpi/initrd_table_override.txt for details
237 config ACPI_BLACKLIST_YEAR
238 int "Disable ACPI for systems before Jan 1st this year" if X86_32
241 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
242 on platforms with DMI BIOS date before January 1st that year.
243 "acpi=force" can be used to override this mechanism.
245 Enter 0 to disable this mechanism and allow ACPI to
246 run by default no matter what the year. (default)
249 bool "Debug Statements"
252 The ACPI subsystem can produce debug output. Saying Y enables this
253 output and increases the kernel size by around 50K.
255 Use the acpi.debug_layer and acpi.debug_level kernel command-line
256 parameters documented in Documentation/acpi/debug.txt and
257 Documentation/kernel-parameters.txt to control the type and
258 amount of debug output.
261 bool "PCI slot detection driver"
265 This driver creates entries in /sys/bus/pci/slots/ for all PCI
266 slots in the system. This can help correlate PCI bus addresses,
267 i.e., segment/bus/device/function tuples, with physical slots in
268 the system. If you are unsure, say N.
271 bool "Power Management Timer Support" if EXPERT
275 The Power Management Timer is available on all ACPI-capable,
276 in most cases even if ACPI is unusable or blacklisted.
278 This timing source is not affected by power management features
279 like aggressive processor idling, throttling, frequency and/or
280 voltage scaling, unlike the commonly used Time Stamp Counter
283 You should nearly always say Y here because many modern
284 systems require this timer.
286 config ACPI_CONTAINER
287 bool "Container and Module Devices"
288 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
290 This driver supports ACPI Container and Module devices (IDs
291 ACPI0004, PNP0A05, and PNP0A06).
293 This helps support hotplug of nodes, CPUs, and memory.
295 To compile this driver as a module, choose M here:
296 the module will be called container.
298 config ACPI_HOTPLUG_MEMORY
299 bool "Memory Hotplug"
300 depends on MEMORY_HOTPLUG
302 This driver supports ACPI memory hotplug. The driver
303 fields notifications on ACPI memory devices (PNP0C80),
304 which represent memory ranges that may be onlined or
305 offlined during runtime.
307 If your hardware and firmware do not support adding or
308 removing memory devices at runtime, you need not enable
311 To compile this driver as a module, choose M here:
312 the module will be called acpi_memhotplug.
315 tristate "Smart Battery System"
319 This driver supports the Smart Battery System, another
320 type of access to battery information, found on some laptops.
322 To compile this driver as a module, choose M here:
323 the modules will be called sbs and sbshc.
326 tristate "Hardware Error Device"
328 This driver supports the Hardware Error Device (PNP0C33),
329 which is used to report some hardware errors notified via
330 SCI, mainly the corrected errors.
332 config ACPI_CUSTOM_METHOD
333 tristate "Allow ACPI methods to be inserted/replaced at run time"
337 This debug facility allows ACPI AML methods to be inserted and/or
338 replaced without rebooting the system. For details refer to:
339 Documentation/acpi/method-customizing.txt.
341 NOTE: This option is security sensitive, because it allows arbitrary
342 kernel memory to be written to by root (uid=0) users, allowing them
343 to bypass certain security measures (e.g. if root is not allowed to
344 load additional kernel modules after boot, this feature may be used
345 to override that restriction).
348 bool "Boottime Graphics Resource Table support"
349 depends on EFI && X86
351 This driver adds support for exposing the ACPI Boottime Graphics
352 Resource Table, which allows the operating system to obtain
353 data from the firmware boot splash. It will appear under
354 /sys/firmware/acpi/bgrt/ .
356 source "drivers/acpi/apei/Kconfig"