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 <http://www.lesswatts.org/projects/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52 they have been replaced by functions in /sys.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_PROCFS_POWER
60 bool "Deprecated power /proc/acpi directories"
63 For backwards compatibility, this option allows
64 deprecated power /proc/acpi/ directories to exist, even when
65 they have been replaced by functions in /sys.
66 The deprecated directories (and their replacements) include:
67 /proc/acpi/battery/* (/sys/class/power_supply/*)
68 /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
69 This option has no effect on /proc/acpi/ directories
70 and functions, which do not yet exist in /sys
71 This option, together with the proc directories, will be
74 Say N to delete power /proc/acpi/ directories that have moved to /sys/
76 config ACPI_EC_DEBUGFS
77 tristate "EC read/write access through /sys/kernel/debug/ec"
80 Say N to disable Embedded Controller /sys/kernel/debug interface
82 Be aware that using this interface can confuse your Embedded
83 Controller in a way that a normal reboot is not enough. You then
84 have to power off your system, and remove the laptop battery for
86 An Embedded Controller typically is available on laptops and reads
87 sensor values like battery state and temperature.
88 The kernel accesses the EC through ACPI parsed code provided by BIOS
89 tables. This option allows to access the EC directly without ACPI
91 Thus this option is a debug option that helps to write ACPI drivers
92 and can be used to identify ACPI code or EC firmware bugs.
100 This driver supports the AC Adapter object, which indicates
101 whether a system is on AC or not. If you have a system that can
102 switch between A/C and battery, say Y.
104 To compile this driver as a module, choose M here:
105 the module will be called ac.
113 This driver adds support for battery information through
114 /proc/acpi/battery. If you have a mobile system with a battery,
117 To compile this driver as a module, choose M here:
118 the module will be called battery.
125 This driver handles events on the power, sleep, and lid buttons.
126 A daemon reads /proc/acpi/event and perform user-defined actions
127 such as shutting down the system. This is necessary for
128 software-controlled poweroff.
130 To compile this driver as a module, choose M here:
131 the module will be called button.
135 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
139 This driver implements the ACPI Extensions For Display Adapters
140 for integrated graphics devices on motherboard, as specified in
141 ACPI 2.0 Specification, Appendix B. This supports basic operations
142 such as defining the video POST device, retrieving EDID information,
143 and setting up a video output.
145 To compile this driver as a module, choose M here:
146 the module will be called video.
153 This driver supports ACPI fan devices, allowing user-mode
154 applications to perform basic fan control (on, off, status).
156 To compile this driver as a module, choose M here:
157 the module will be called fan.
162 This driver supports ACPI-controlled docking stations and removable
163 drive bays such as the IBM Ultrabay and the Dell Module Bay.
169 ACPI I2C enumeration support.
171 config ACPI_PROCESSOR
177 This driver installs ACPI as the idle handler for Linux and uses
178 ACPI C2 and C3 processor states to save power on systems that
179 support it. It is required by several flavors of cpufreq
180 performance-state drivers.
182 To compile this driver as a module, choose M here:
183 the module will be called processor.
186 depends on IPMI_SI && IPMI_HANDLER
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
260 config ACPI_BLACKLIST_YEAR
261 int "Disable ACPI for systems before Jan 1st this year" if X86_32
264 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
265 on platforms with DMI BIOS date before January 1st that year.
266 "acpi=force" can be used to override this mechanism.
268 Enter 0 to disable this mechanism and allow ACPI to
269 run by default no matter what the year. (default)
272 bool "Debug Statements"
275 The ACPI subsystem can produce debug output. Saying Y enables this
276 output and increases the kernel size by around 50K.
278 Use the acpi.debug_layer and acpi.debug_level kernel command-line
279 parameters documented in Documentation/acpi/debug.txt and
280 Documentation/kernel-parameters.txt to control the type and
281 amount of debug output.
284 bool "PCI slot detection driver"
288 This driver creates entries in /sys/bus/pci/slots/ for all PCI
289 slots in the system. This can help correlate PCI bus addresses,
290 i.e., segment/bus/device/function tuples, with physical slots in
291 the system. If you are unsure, say N.
294 bool "Power Management Timer Support" if EXPERT
298 The Power Management Timer is available on all ACPI-capable,
299 in most cases even if ACPI is unusable or blacklisted.
301 This timing source is not affected by power management features
302 like aggressive processor idling, throttling, frequency and/or
303 voltage scaling, unlike the commonly used Time Stamp Counter
306 You should nearly always say Y here because many modern
307 systems require this timer.
309 config ACPI_CONTAINER
310 bool "Container and Module Devices"
311 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
313 This driver supports ACPI Container and Module devices (IDs
314 ACPI0004, PNP0A05, and PNP0A06).
316 This helps support hotplug of nodes, CPUs, and memory.
318 To compile this driver as a module, choose M here:
319 the module will be called container.
321 config ACPI_HOTPLUG_MEMORY
322 bool "Memory Hotplug"
323 depends on MEMORY_HOTPLUG
325 This driver supports ACPI memory hotplug. The driver
326 fields notifications on ACPI memory devices (PNP0C80),
327 which represent memory ranges that may be onlined or
328 offlined during runtime.
330 If your hardware and firmware do not support adding or
331 removing memory devices at runtime, you need not enable
334 To compile this driver as a module, choose M here:
335 the module will be called acpi_memhotplug.
338 tristate "Smart Battery System"
342 This driver supports the Smart Battery System, another
343 type of access to battery information, found on some laptops.
345 To compile this driver as a module, choose M here:
346 the modules will be called sbs and sbshc.
349 tristate "Hardware Error Device"
351 This driver supports the Hardware Error Device (PNP0C33),
352 which is used to report some hardware errors notified via
353 SCI, mainly the corrected errors.
355 config ACPI_CUSTOM_METHOD
356 tristate "Allow ACPI methods to be inserted/replaced at run time"
360 This debug facility allows ACPI AML methods to be inserted and/or
361 replaced without rebooting the system. For details refer to:
362 Documentation/acpi/method-customizing.txt.
364 NOTE: This option is security sensitive, because it allows arbitrary
365 kernel memory to be written to by root (uid=0) users, allowing them
366 to bypass certain security measures (e.g. if root is not allowed to
367 load additional kernel modules after boot, this feature may be used
368 to override that restriction).
371 bool "Boottime Graphics Resource Table support"
372 depends on EFI && X86
374 This driver adds support for exposing the ACPI Boottime Graphics
375 Resource Table, which allows the operating system to obtain
376 data from the firmware boot splash. It will appear under
377 /sys/firmware/acpi/bgrt/ .
379 source "drivers/acpi/apei/Kconfig"