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52 they have been replaced by functions in /sys.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65 they have been replaced by functions in /sys.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.
165 config ACPI_PROCESSOR
171 This driver installs ACPI as the idle handler for Linux and uses
172 ACPI C2 and C3 processor states to save power on systems that
173 support it. It is required by several flavors of cpufreq
174 performance-state drivers.
176 To compile this driver as a module, choose M here:
177 the module will be called processor.
180 depends on IPMI_SI && IPMI_HANDLER
183 This driver enables the ACPI to access the BMC controller. And it
184 uses the IPMI request/response message to communicate with BMC
185 controller, which can be found on on the server.
187 To compile this driver as a module, choose M here:
188 the module will be called as acpi_ipmi.
190 config ACPI_HOTPLUG_CPU
192 depends on ACPI_PROCESSOR && HOTPLUG_CPU
193 select ACPI_CONTAINER
196 config ACPI_PROCESSOR_AGGREGATOR
197 tristate "Processor Aggregator"
198 depends on ACPI_PROCESSOR
201 ACPI 4.0 defines processor Aggregator, which enables OS to perform
202 specific processor configuration and control that applies to all
203 processors in the platform. Currently only logical processor idling
204 is defined, which is to reduce power consumption. This driver
205 supports the new device.
208 tristate "Thermal Zone"
209 depends on ACPI_PROCESSOR
213 This driver supports ACPI thermal zones. Most mobile and
214 some desktop systems support ACPI thermal zones. It is HIGHLY
215 recommended that this option be enabled, as your processor(s)
216 may be damaged without it.
218 To compile this driver as a module, choose M here:
219 the module will be called thermal.
224 depends on (X86 || IA64)
225 default y if IA64_GENERIC || IA64_SGI_SN2
227 config ACPI_CUSTOM_DSDT_FILE
228 string "Custom DSDT Table file to include"
230 depends on !STANDALONE
232 This option supports a custom DSDT by linking it into the kernel.
233 See Documentation/acpi/dsdt-override.txt
235 Enter the full path name to the file which includes the AmlCode
238 If unsure, don't enter a file name.
240 config ACPI_CUSTOM_DSDT
242 default ACPI_CUSTOM_DSDT_FILE != ""
244 config ACPI_INITRD_TABLE_OVERRIDE
245 bool "ACPI tables override via initrd"
246 depends on BLK_DEV_INITRD && X86
249 This option provides functionality to override arbitrary ACPI tables
250 via initrd. No functional change if no ACPI tables are passed via
251 initrd, therefore it's safe to say Y.
252 See Documentation/acpi/initrd_table_override.txt for details
254 config ACPI_BLACKLIST_YEAR
255 int "Disable ACPI for systems before Jan 1st this year" if X86_32
258 Enter a 4-digit year, e.g., 2001, to disable ACPI by default
259 on platforms with DMI BIOS date before January 1st that year.
260 "acpi=force" can be used to override this mechanism.
262 Enter 0 to disable this mechanism and allow ACPI to
263 run by default no matter what the year. (default)
266 bool "Debug Statements"
269 The ACPI subsystem can produce debug output. Saying Y enables this
270 output and increases the kernel size by around 50K.
272 Use the acpi.debug_layer and acpi.debug_level kernel command-line
273 parameters documented in Documentation/acpi/debug.txt and
274 Documentation/kernel-parameters.txt to control the type and
275 amount of debug output.
278 bool "PCI slot detection driver"
282 This driver creates entries in /sys/bus/pci/slots/ for all PCI
283 slots in the system. This can help correlate PCI bus addresses,
284 i.e., segment/bus/device/function tuples, with physical slots in
285 the system. If you are unsure, say N.
288 bool "Power Management Timer Support" if EXPERT
292 The Power Management Timer is available on all ACPI-capable,
293 in most cases even if ACPI is unusable or blacklisted.
295 This timing source is not affected by power management features
296 like aggressive processor idling, throttling, frequency and/or
297 voltage scaling, unlike the commonly used Time Stamp Counter
300 You should nearly always say Y here because many modern
301 systems require this timer.
303 config ACPI_CONTAINER
304 bool "Container and Module Devices"
305 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU)
307 This driver supports ACPI Container and Module devices (IDs
308 ACPI0004, PNP0A05, and PNP0A06).
310 This helps support hotplug of nodes, CPUs, and memory.
312 To compile this driver as a module, choose M here:
313 the module will be called container.
315 config ACPI_HOTPLUG_MEMORY
316 bool "Memory Hotplug"
317 depends on MEMORY_HOTPLUG
319 This driver supports ACPI memory hotplug. The driver
320 fields notifications on ACPI memory devices (PNP0C80),
321 which represent memory ranges that may be onlined or
322 offlined during runtime.
324 If your hardware and firmware do not support adding or
325 removing memory devices at runtime, you need not enable
328 To compile this driver as a module, choose M here:
329 the module will be called acpi_memhotplug.
332 tristate "Smart Battery System"
336 This driver supports the Smart Battery System, another
337 type of access to battery information, found on some laptops.
339 To compile this driver as a module, choose M here:
340 the modules will be called sbs and sbshc.
343 tristate "Hardware Error Device"
345 This driver supports the Hardware Error Device (PNP0C33),
346 which is used to report some hardware errors notified via
347 SCI, mainly the corrected errors.
349 config ACPI_CUSTOM_METHOD
350 tristate "Allow ACPI methods to be inserted/replaced at run time"
354 This debug facility allows ACPI AML methods to be inserted and/or
355 replaced without rebooting the system. For details refer to:
356 Documentation/acpi/method-customizing.txt.
358 NOTE: This option is security sensitive, because it allows arbitrary
359 kernel memory to be written to by root (uid=0) users, allowing them
360 to bypass certain security measures (e.g. if root is not allowed to
361 load additional kernel modules after boot, this feature may be used
362 to override that restriction).
365 bool "Boottime Graphics Resource Table support"
366 depends on EFI && X86
368 This driver adds support for exposing the ACPI Boottime Graphics
369 Resource Table, which allows the operating system to obtain
370 data from the firmware boot splash. It will appear under
371 /sys/firmware/acpi/bgrt/ .
373 source "drivers/acpi/apei/Kconfig"