1# 2# ACPI Configuration 3# 4 5menuconfig ACPI 6 bool "ACPI (Advanced Configuration and Power Interface) Support" 7 depends on !IA64_HP_SIM 8 depends on IA64 || X86 9 depends on PCI 10 select PNP 11 default y 12 help 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 17 kernel by about 70K. 18 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. 25 26 The project home page for the Linux ACPI subsystem is here: 27 <https://01.org/linux-acpi> 28 29 Linux support for ACPI is based on Intel Corporation's ACPI 30 Component Architecture (ACPI CA). For more information on the 31 ACPI CA, see: 32 <http://acpica.org/> 33 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> 42 43if ACPI 44 45config ACPI_SLEEP 46 bool 47 depends on SUSPEND || HIBERNATION 48 default y 49 50config ACPI_PROCFS_POWER 51 bool "Deprecated power /proc/acpi directories" 52 depends on PROC_FS 53 help 54 For backwards compatibility, this option allows 55 deprecated power /proc/acpi/ directories to exist, even when 56 they have been replaced by functions in /sys. 57 The deprecated directories (and their replacements) include: 58 /proc/acpi/battery/* (/sys/class/power_supply/*) 59 /proc/acpi/ac_adapter/* (sys/class/power_supply/*) 60 This option has no effect on /proc/acpi/ directories 61 and functions, which do not yet exist in /sys 62 This option, together with the proc directories, will be 63 deleted in the future. 64 65 Say N to delete power /proc/acpi/ directories that have moved to /sys/ 66 67config ACPI_EC_DEBUGFS 68 tristate "EC read/write access through /sys/kernel/debug/ec" 69 default n 70 help 71 Say N to disable Embedded Controller /sys/kernel/debug interface 72 73 Be aware that using this interface can confuse your Embedded 74 Controller in a way that a normal reboot is not enough. You then 75 have to power off your system, and remove the laptop battery for 76 some seconds. 77 An Embedded Controller typically is available on laptops and reads 78 sensor values like battery state and temperature. 79 The kernel accesses the EC through ACPI parsed code provided by BIOS 80 tables. This option allows to access the EC directly without ACPI 81 code being involved. 82 Thus this option is a debug option that helps to write ACPI drivers 83 and can be used to identify ACPI code or EC firmware bugs. 84 85config ACPI_AC 86 tristate "AC Adapter" 87 depends on X86 88 select POWER_SUPPLY 89 default y 90 help 91 This driver supports the AC Adapter object, which indicates 92 whether a system is on AC or not. If you have a system that can 93 switch between A/C and battery, say Y. 94 95 To compile this driver as a module, choose M here: 96 the module will be called ac. 97 98config ACPI_BATTERY 99 tristate "Battery" 100 depends on X86 101 select POWER_SUPPLY 102 default y 103 help 104 This driver adds support for battery information through 105 /proc/acpi/battery. If you have a mobile system with a battery, 106 say Y. 107 108 To compile this driver as a module, choose M here: 109 the module will be called battery. 110 111config ACPI_BUTTON 112 tristate "Button" 113 depends on INPUT 114 default y 115 help 116 This driver handles events on the power, sleep, and lid buttons. 117 A daemon reads events from input devices or via netlink and 118 performs user-defined actions such as shutting down the system. 119 This is necessary for software-controlled poweroff. 120 121 To compile this driver as a module, choose M here: 122 the module will be called button. 123 124config ACPI_VIDEO 125 tristate "Video" 126 depends on X86 && BACKLIGHT_CLASS_DEVICE 127 depends on INPUT 128 select THERMAL 129 help 130 This driver implements the ACPI Extensions For Display Adapters 131 for integrated graphics devices on motherboard, as specified in 132 ACPI 2.0 Specification, Appendix B. This supports basic operations 133 such as defining the video POST device, retrieving EDID information, 134 and setting up a video output. 135 136 To compile this driver as a module, choose M here: 137 the module will be called video. 138 139config ACPI_FAN 140 tristate "Fan" 141 select THERMAL 142 default y 143 help 144 This driver supports ACPI fan devices, allowing user-mode 145 applications to perform basic fan control (on, off, status). 146 147 To compile this driver as a module, choose M here: 148 the module will be called fan. 149 150config ACPI_DOCK 151 bool "Dock" 152 help 153 This driver supports ACPI-controlled docking stations and removable 154 drive bays such as the IBM Ultrabay and the Dell Module Bay. 155 156config ACPI_PROCESSOR 157 tristate "Processor" 158 select THERMAL 159 select CPU_IDLE 160 default y 161 help 162 This driver installs ACPI as the idle handler for Linux and uses 163 ACPI C2 and C3 processor states to save power on systems that 164 support it. It is required by several flavors of cpufreq 165 performance-state drivers. 166 167 To compile this driver as a module, choose M here: 168 the module will be called processor. 169 170config ACPI_IPMI 171 tristate "IPMI" 172 depends on IPMI_SI 173 default n 174 help 175 This driver enables the ACPI to access the BMC controller. And it 176 uses the IPMI request/response message to communicate with BMC 177 controller, which can be found on on the server. 178 179 To compile this driver as a module, choose M here: 180 the module will be called as acpi_ipmi. 181 182config ACPI_HOTPLUG_CPU 183 bool 184 depends on ACPI_PROCESSOR && HOTPLUG_CPU 185 select ACPI_CONTAINER 186 default y 187 188config ACPI_PROCESSOR_AGGREGATOR 189 tristate "Processor Aggregator" 190 depends on ACPI_PROCESSOR 191 depends on X86 192 help 193 ACPI 4.0 defines processor Aggregator, which enables OS to perform 194 specific processor configuration and control that applies to all 195 processors in the platform. Currently only logical processor idling 196 is defined, which is to reduce power consumption. This driver 197 supports the new device. 198 199config ACPI_THERMAL 200 tristate "Thermal Zone" 201 depends on ACPI_PROCESSOR 202 select THERMAL 203 default y 204 help 205 This driver supports ACPI thermal zones. Most mobile and 206 some desktop systems support ACPI thermal zones. It is HIGHLY 207 recommended that this option be enabled, as your processor(s) 208 may be damaged without it. 209 210 To compile this driver as a module, choose M here: 211 the module will be called thermal. 212 213config ACPI_NUMA 214 bool "NUMA support" 215 depends on NUMA 216 depends on (X86 || IA64) 217 default y if IA64_GENERIC || IA64_SGI_SN2 218 219config ACPI_CUSTOM_DSDT_FILE 220 string "Custom DSDT Table file to include" 221 default "" 222 depends on !STANDALONE 223 help 224 This option supports a custom DSDT by linking it into the kernel. 225 See Documentation/acpi/dsdt-override.txt 226 227 Enter the full path name to the file which includes the AmlCode 228 declaration. 229 230 If unsure, don't enter a file name. 231 232config ACPI_CUSTOM_DSDT 233 bool 234 default ACPI_CUSTOM_DSDT_FILE != "" 235 236config ACPI_INITRD_TABLE_OVERRIDE 237 bool "ACPI tables override via initrd" 238 depends on BLK_DEV_INITRD && X86 239 default n 240 help 241 This option provides functionality to override arbitrary ACPI tables 242 via initrd. No functional change if no ACPI tables are passed via 243 initrd, therefore it's safe to say Y. 244 See Documentation/acpi/initrd_table_override.txt for details 245 246config ACPI_DEBUG 247 bool "Debug Statements" 248 default n 249 help 250 The ACPI subsystem can produce debug output. Saying Y enables this 251 output and increases the kernel size by around 50K. 252 253 Use the acpi.debug_layer and acpi.debug_level kernel command-line 254 parameters documented in Documentation/acpi/debug.txt and 255 Documentation/kernel-parameters.txt to control the type and 256 amount of debug output. 257 258config ACPI_PCI_SLOT 259 bool "PCI slot detection driver" 260 depends on SYSFS 261 default n 262 help 263 This driver creates entries in /sys/bus/pci/slots/ for all PCI 264 slots in the system. This can help correlate PCI bus addresses, 265 i.e., segment/bus/device/function tuples, with physical slots in 266 the system. If you are unsure, say N. 267 268config X86_PM_TIMER 269 bool "Power Management Timer Support" if EXPERT 270 depends on X86 271 default y 272 help 273 The Power Management Timer is available on all ACPI-capable, 274 in most cases even if ACPI is unusable or blacklisted. 275 276 This timing source is not affected by power management features 277 like aggressive processor idling, throttling, frequency and/or 278 voltage scaling, unlike the commonly used Time Stamp Counter 279 (TSC) timing source. 280 281 You should nearly always say Y here because many modern 282 systems require this timer. 283 284config ACPI_CONTAINER 285 bool "Container and Module Devices" 286 default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU) 287 help 288 This driver supports ACPI Container and Module devices (IDs 289 ACPI0004, PNP0A05, and PNP0A06). 290 291 This helps support hotplug of nodes, CPUs, and memory. 292 293 To compile this driver as a module, choose M here: 294 the module will be called container. 295 296config ACPI_HOTPLUG_MEMORY 297 bool "Memory Hotplug" 298 depends on MEMORY_HOTPLUG 299 help 300 This driver supports ACPI memory hotplug. The driver 301 fields notifications on ACPI memory devices (PNP0C80), 302 which represent memory ranges that may be onlined or 303 offlined during runtime. 304 305 If your hardware and firmware do not support adding or 306 removing memory devices at runtime, you need not enable 307 this driver. 308 309 To compile this driver as a module, choose M here: 310 the module will be called acpi_memhotplug. 311 312config ACPI_SBS 313 tristate "Smart Battery System" 314 depends on X86 315 select POWER_SUPPLY 316 help 317 This driver supports the Smart Battery System, another 318 type of access to battery information, found on some laptops. 319 320 To compile this driver as a module, choose M here: 321 the modules will be called sbs and sbshc. 322 323config ACPI_HED 324 tristate "Hardware Error Device" 325 help 326 This driver supports the Hardware Error Device (PNP0C33), 327 which is used to report some hardware errors notified via 328 SCI, mainly the corrected errors. 329 330config ACPI_CUSTOM_METHOD 331 tristate "Allow ACPI methods to be inserted/replaced at run time" 332 depends on DEBUG_FS 333 default n 334 help 335 This debug facility allows ACPI AML methods to be inserted and/or 336 replaced without rebooting the system. For details refer to: 337 Documentation/acpi/method-customizing.txt. 338 339 NOTE: This option is security sensitive, because it allows arbitrary 340 kernel memory to be written to by root (uid=0) users, allowing them 341 to bypass certain security measures (e.g. if root is not allowed to 342 load additional kernel modules after boot, this feature may be used 343 to override that restriction). 344 345config ACPI_BGRT 346 bool "Boottime Graphics Resource Table support" 347 depends on EFI && X86 348 help 349 This driver adds support for exposing the ACPI Boottime Graphics 350 Resource Table, which allows the operating system to obtain 351 data from the firmware boot splash. It will appear under 352 /sys/firmware/acpi/bgrt/ . 353 354config ACPI_REDUCED_HARDWARE_ONLY 355 bool "Hardware-reduced ACPI support only" if EXPERT 356 def_bool n 357 depends on ACPI 358 help 359 This config item changes the way the ACPI code is built. When this 360 option is selected, the kernel will use a specialized version of 361 ACPICA that ONLY supports the ACPI "reduced hardware" mode. The 362 resulting kernel will be smaller but it will also be restricted to 363 running in ACPI reduced hardware mode ONLY. 364 365 If you are unsure what to do, do not enable this option. 366 367source "drivers/acpi/apei/Kconfig" 368 369config ACPI_EXTLOG 370 tristate "Extended Error Log support" 371 depends on X86_MCE && X86_LOCAL_APIC 372 select UEFI_CPER 373 default n 374 help 375 Certain usages such as Predictive Failure Analysis (PFA) require 376 more information about the error than what can be described in 377 processor machine check banks. Most server processors log 378 additional information about the error in processor uncore 379 registers. Since the addresses and layout of these registers vary 380 widely from one processor to another, system software cannot 381 readily make use of them. To complicate matters further, some of 382 the additional error information cannot be constructed without 383 detailed knowledge about platform topology. 384 385 Enhanced MCA Logging allows firmware to provide additional error 386 information to system software, synchronous with MCE or CMCI. This 387 driver adds support for that functionality. 388 389endif # ACPI 390