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52 they have been replaced by functions in /sys.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65 they have been replaced by functions in /sys.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.
94 config ACPI_PROC_EVENT
95 bool "Deprecated /proc/acpi/event support"
99 A user-space daemon, acpid, typically reads /proc/acpi/event
100 and handles all ACPI-generated events.
102 These events are now delivered to user-space either
103 via the input layer or as netlink events.
105 This build option enables the old code for legacy
106 user-space implementation. After some time, this will
107 be moved under CONFIG_ACPI_PROCFS, and then deleted.
109 Say Y here to retain the old behaviour. Say N if your
110 user-space is newer than kernel 2.6.23 (September 2007).
113 tristate "AC Adapter"
118 This driver supports the AC Adapter object, which indicates
119 whether a system is on AC or not. If you have a system that can
120 switch between A/C and battery, say Y.
122 To compile this driver as a module, choose M here:
123 the module will be called ac.
131 This driver adds support for battery information through
132 /proc/acpi/battery. If you have a mobile system with a battery,
135 To compile this driver as a module, choose M here:
136 the module will be called battery.
143 This driver handles events on the power, sleep, and lid buttons.
144 A daemon reads /proc/acpi/event and perform user-defined actions
145 such as shutting down the system. This is necessary for
146 software-controlled poweroff.
148 To compile this driver as a module, choose M here:
149 the module will be called button.
153 depends on X86 && BACKLIGHT_CLASS_DEVICE && VIDEO_OUTPUT_CONTROL
157 This driver implements the ACPI Extensions For Display Adapters
158 for integrated graphics devices on motherboard, as specified in
159 ACPI 2.0 Specification, Appendix B. This supports basic operations
160 such as defining the video POST device, retrieving EDID information,
161 and setting up a video output.
163 To compile this driver as a module, choose M here:
164 the module will be called video.
171 This driver supports ACPI fan devices, allowing user-mode
172 applications to perform basic fan control (on, off, status).
174 To compile this driver as a module, choose M here:
175 the module will be called fan.
180 This driver supports ACPI-controlled docking stations and removable
181 drive bays such as the IBM Ultrabay and the Dell Module Bay.
187 ACPI I2C enumeration support.
189 config ACPI_PROCESSOR
195 This driver installs ACPI as the idle handler for Linux and uses
196 ACPI C2 and C3 processor states to save power on systems that
197 support it. It is required by several flavors of cpufreq
198 performance-state drivers.
200 To compile this driver as a module, choose M here:
201 the module will be called processor.
204 depends on IPMI_SI && IPMI_HANDLER
207 This driver enables the ACPI to access the BMC controller. And it
208 uses the IPMI request/response message to communicate with BMC
209 controller, which can be found on on the server.
211 To compile this driver as a module, choose M here:
212 the module will be called as acpi_ipmi.
214 config ACPI_HOTPLUG_CPU
216 depends on ACPI_PROCESSOR && HOTPLUG_CPU
217 select ACPI_CONTAINER
220 config ACPI_PROCESSOR_AGGREGATOR
221 tristate "Processor Aggregator"
222 depends on ACPI_PROCESSOR
225 ACPI 4.0 defines processor Aggregator, which enables OS to perform
226 specific processor configuration and control that applies to all
227 processors in the platform. Currently only logical processor idling
228 is defined, which is to reduce power consumption. This driver
229 supports the new device.
232 tristate "Thermal Zone"
233 depends on ACPI_PROCESSOR
237 This driver supports ACPI thermal zones. Most mobile and
238 some desktop systems support ACPI thermal zones. It is HIGHLY
239 recommended that this option be enabled, as your processor(s)
240 may be damaged without it.
242 To compile this driver as a module, choose M here:
243 the module will be called thermal.
248 depends on (X86 || IA64)
249 default y if IA64_GENERIC || IA64_SGI_SN2
251 config ACPI_CUSTOM_DSDT_FILE
252 string "Custom DSDT Table file to include"
254 depends on !STANDALONE
256 This option supports a custom DSDT by linking it into the kernel.
257 See Documentation/acpi/dsdt-override.txt
259 Enter the full path name to the file which includes the AmlCode
262 If unsure, don't enter a file name.
264 config ACPI_CUSTOM_DSDT
266 default ACPI_CUSTOM_DSDT_FILE != ""
268 config ACPI_INITRD_TABLE_OVERRIDE
269 bool "ACPI tables can be passed via uncompressed cpio in initrd"
272 This option provides functionality to override arbitrary ACPI tables
273 via initrd. No functional change if no ACPI tables are passed via
274 initrd, therefore it's safe to say Y.
275 See Documentation/acpi/initrd_table_override.txt for details
277 config ACPI_BLACKLIST_YEAR
278 int "Disable ACPI for systems before Jan 1st this year" if X86_32
281 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
282 on platforms with DMI BIOS date before January 1st that year.
283 "acpi=force" can be used to override this mechanism.
285 Enter 0 to disable this mechanism and allow ACPI to
286 run by default no matter what the year. (default)
289 bool "Debug Statements"
292 The ACPI subsystem can produce debug output. Saying Y enables this
293 output and increases the kernel size by around 50K.
295 Use the acpi.debug_layer and acpi.debug_level kernel command-line
296 parameters documented in Documentation/acpi/debug.txt and
297 Documentation/kernel-parameters.txt to control the type and
298 amount of debug output.
300 config ACPI_DEBUG_FUNC_TRACE
301 bool "Additionally enable ACPI function tracing"
303 depends on ACPI_DEBUG
305 ACPI Debug Statements slow down ACPI processing. Function trace
306 is about half of the penalty and is rarely useful.
309 bool "PCI slot detection driver"
313 This driver creates entries in /sys/bus/pci/slots/ for all PCI
314 slots in the system. This can help correlate PCI bus addresses,
315 i.e., segment/bus/device/function tuples, with physical slots in
316 the system. If you are unsure, say N.
319 bool "Power Management Timer Support" if EXPERT
323 The Power Management Timer is available on all ACPI-capable,
324 in most cases even if ACPI is unusable or blacklisted.
326 This timing source is not affected by power management features
327 like aggressive processor idling, throttling, frequency and/or
328 voltage scaling, unlike the commonly used Time Stamp Counter
331 You should nearly always say Y here because many modern
332 systems require this timer.
334 config ACPI_CONTAINER
335 bool "Container and Module Devices"
336 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU || ACPI_HOTPLUG_IO)
338 This driver supports ACPI Container and Module devices (IDs
339 ACPI0004, PNP0A05, and PNP0A06).
341 This helps support hotplug of nodes, CPUs, and memory.
343 To compile this driver as a module, choose M here:
344 the module will be called container.
346 config ACPI_HOTPLUG_MEMORY
347 tristate "Memory Hotplug"
348 depends on MEMORY_HOTPLUG
351 This driver supports ACPI memory hotplug. The driver
352 fields notifications on ACPI memory devices (PNP0C80),
353 which represent memory ranges that may be onlined or
354 offlined during runtime.
356 If your hardware and firmware do not support adding or
357 removing memory devices at runtime, you need not enable
360 To compile this driver as a module, choose M here:
361 the module will be called acpi_memhotplug.
364 tristate "Smart Battery System"
368 This driver supports the Smart Battery System, another
369 type of access to battery information, found on some laptops.
371 To compile this driver as a module, choose M here:
372 the modules will be called sbs and sbshc.
375 tristate "Hardware Error Device"
377 This driver supports the Hardware Error Device (PNP0C33),
378 which is used to report some hardware errors notified via
379 SCI, mainly the corrected errors.
381 config ACPI_CUSTOM_METHOD
382 tristate "Allow ACPI methods to be inserted/replaced at run time"
386 This debug facility allows ACPI AML methods to be inserted and/or
387 replaced without rebooting the system. For details refer to:
388 Documentation/acpi/method-customizing.txt.
390 NOTE: This option is security sensitive, because it allows arbitrary
391 kernel memory to be written to by root (uid=0) users, allowing them
392 to bypass certain security measures (e.g. if root is not allowed to
393 load additional kernel modules after boot, this feature may be used
394 to override that restriction).
397 bool "Boottime Graphics Resource Table support"
400 This driver adds support for exposing the ACPI Boottime Graphics
401 Resource Table, which allows the operating system to obtain
402 data from the firmware boot splash. It will appear under
403 /sys/firmware/acpi/bgrt/ .
405 source "drivers/acpi/apei/Kconfig"