# # ACPI Configuration # menuconfig ACPI bool "ACPI (Advanced Configuration and Power Interface) Support" depends on !IA64_HP_SIM depends on IA64 || X86 depends on PCI select PNP default y help Advanced Configuration and Power Interface (ACPI) support for Linux requires an ACPI-compliant platform (hardware/firmware), and assumes the presence of OS-directed configuration and power management (OSPM) software. This option will enlarge your kernel by about 70K. Linux ACPI provides a robust functional replacement for several legacy configuration and power management interfaces, including the Plug-and-Play BIOS specification (PnP BIOS), the MultiProcessor Specification (MPS), and the Advanced Power Management (APM) specification. If both ACPI and APM support are configured, ACPI is used. The project home page for the Linux ACPI subsystem is here: Linux support for ACPI is based on Intel Corporation's ACPI Component Architecture (ACPI CA). For more information on the ACPI CA, see: ACPI is an open industry specification originally co-developed by Hewlett-Packard, Intel, Microsoft, Phoenix, and Toshiba. Currently, it is developed by the ACPI Specification Working Group (ASWG) under the UEFI Forum and any UEFI member can join the ASWG and contribute to the ACPI specification. The specification is available at: if ACPI config ACPI_LEGACY_TABLES_LOOKUP bool config ARCH_MIGHT_HAVE_ACPI_PDC bool config ACPI_SLEEP bool depends on SUSPEND || HIBERNATION default y config ACPI_PROCFS_POWER bool "Deprecated power /proc/acpi directories" depends on PROC_FS help For backwards compatibility, this option allows deprecated power /proc/acpi/ directories to exist, even when they have been replaced by functions in /sys. The deprecated directories (and their replacements) include: /proc/acpi/battery/* (/sys/class/power_supply/*) /proc/acpi/ac_adapter/* (sys/class/power_supply/*) This option has no effect on /proc/acpi/ directories and functions, which do not yet exist in /sys This option, together with the proc directories, will be deleted in the future. Say N to delete power /proc/acpi/ directories that have moved to /sys/ config ACPI_EC_DEBUGFS tristate "EC read/write access through /sys/kernel/debug/ec" default n help Say N to disable Embedded Controller /sys/kernel/debug interface Be aware that using this interface can confuse your Embedded Controller in a way that a normal reboot is not enough. You then have to power off your system, and remove the laptop battery for some seconds. An Embedded Controller typically is available on laptops and reads sensor values like battery state and temperature. The kernel accesses the EC through ACPI parsed code provided by BIOS tables. This option allows to access the EC directly without ACPI code being involved. Thus this option is a debug option that helps to write ACPI drivers and can be used to identify ACPI code or EC firmware bugs. config ACPI_AC tristate "AC Adapter" depends on X86 select POWER_SUPPLY default y help This driver supports the AC Adapter object, which indicates whether a system is on AC or not. If you have a system that can switch between A/C and battery, say Y. To compile this driver as a module, choose M here: the module will be called ac. config ACPI_BATTERY tristate "Battery" depends on X86 select POWER_SUPPLY default y help This driver adds support for battery information through /proc/acpi/battery. If you have a mobile system with a battery, say Y. To compile this driver as a module, choose M here: the module will be called battery. config ACPI_BUTTON tristate "Button" depends on INPUT default y help This driver handles events on the power, sleep, and lid buttons. A daemon reads events from input devices or via netlink and performs user-defined actions such as shutting down the system. This is necessary for software-controlled poweroff. To compile this driver as a module, choose M here: the module will be called button. config ACPI_VIDEO tristate "Video" depends on X86 && BACKLIGHT_CLASS_DEVICE depends on INPUT select THERMAL help This driver implements the ACPI Extensions For Display Adapters for integrated graphics devices on motherboard, as specified in ACPI 2.0 Specification, Appendix B. This supports basic operations such as defining the video POST device, retrieving EDID information, and setting up a video output. To compile this driver as a module, choose M here: the module will be called video. config ACPI_FAN tristate "Fan" depends on THERMAL default y help This driver supports ACPI fan devices, allowing user-mode applications to perform basic fan control (on, off, status). To compile this driver as a module, choose M here: the module will be called fan. config ACPI_DOCK bool "Dock" help This driver supports ACPI-controlled docking stations and removable drive bays such as the IBM Ultrabay and the Dell Module Bay. config ACPI_PROCESSOR tristate "Processor" select THERMAL select CPU_IDLE default y help This driver installs ACPI as the idle handler for Linux and uses ACPI C2 and C3 processor states to save power on systems that support it. It is required by several flavors of cpufreq performance-state drivers. To compile this driver as a module, choose M here: the module will be called processor. config ACPI_IPMI tristate "IPMI" depends on IPMI_SI default n help This driver enables the ACPI to access the BMC controller. And it uses the IPMI request/response message to communicate with BMC controller, which can be found on on the server. To compile this driver as a module, choose M here: the module will be called as acpi_ipmi. config ACPI_HOTPLUG_CPU bool depends on ACPI_PROCESSOR && HOTPLUG_CPU select ACPI_CONTAINER default y config ACPI_PROCESSOR_AGGREGATOR tristate "Processor Aggregator" depends on ACPI_PROCESSOR depends on X86 help ACPI 4.0 defines processor Aggregator, which enables OS to perform specific processor configuration and control that applies to all processors in the platform. Currently only logical processor idling is defined, which is to reduce power consumption. This driver supports the new device. config ACPI_THERMAL tristate "Thermal Zone" depends on ACPI_PROCESSOR select THERMAL default y help This driver supports ACPI thermal zones. Most mobile and some desktop systems support ACPI thermal zones. It is HIGHLY recommended that this option be enabled, as your processor(s) may be damaged without it. To compile this driver as a module, choose M here: the module will be called thermal. config ACPI_NUMA bool "NUMA support" depends on NUMA depends on (X86 || IA64) default y if IA64_GENERIC || IA64_SGI_SN2 config ACPI_CUSTOM_DSDT_FILE string "Custom DSDT Table file to include" default "" depends on !STANDALONE help This option supports a custom DSDT by linking it into the kernel. See Documentation/acpi/dsdt-override.txt Enter the full path name to the file which includes the AmlCode declaration. If unsure, don't enter a file name. config ACPI_CUSTOM_DSDT bool default ACPI_CUSTOM_DSDT_FILE != "" config ACPI_INITRD_TABLE_OVERRIDE bool "ACPI tables override via initrd" depends on BLK_DEV_INITRD && X86 default n help This option provides functionality to override arbitrary ACPI tables via initrd. No functional change if no ACPI tables are passed via initrd, therefore it's safe to say Y. See Documentation/acpi/initrd_table_override.txt for details config ACPI_DEBUG bool "Debug Statements" default n help The ACPI subsystem can produce debug output. Saying Y enables this output and increases the kernel size by around 50K. Use the acpi.debug_layer and acpi.debug_level kernel command-line parameters documented in Documentation/acpi/debug.txt and Documentation/kernel-parameters.txt to control the type and amount of debug output. config ACPI_PCI_SLOT bool "PCI slot detection driver" depends on SYSFS default n help This driver creates entries in /sys/bus/pci/slots/ for all PCI slots in the system. This can help correlate PCI bus addresses, i.e., segment/bus/device/function tuples, with physical slots in the system. If you are unsure, say N. config X86_PM_TIMER bool "Power Management Timer Support" if EXPERT depends on X86 default y help The Power Management Timer is available on all ACPI-capable, in most cases even if ACPI is unusable or blacklisted. This timing source is not affected by power management features like aggressive processor idling, throttling, frequency and/or voltage scaling, unlike the commonly used Time Stamp Counter (TSC) timing source. You should nearly always say Y here because many modern systems require this timer. config ACPI_CONTAINER bool "Container and Module Devices" default (ACPI_HOTPLUG_MEMORY || ACPI_HOTPLUG_CPU) help This driver supports ACPI Container and Module devices (IDs ACPI0004, PNP0A05, and PNP0A06). This helps support hotplug of nodes, CPUs, and memory. To compile this driver as a module, choose M here: the module will be called container. config ACPI_HOTPLUG_MEMORY bool "Memory Hotplug" depends on MEMORY_HOTPLUG help This driver supports ACPI memory hotplug. The driver fields notifications on ACPI memory devices (PNP0C80), which represent memory ranges that may be onlined or offlined during runtime. If your hardware and firmware do not support adding or removing memory devices at runtime, you need not enable this driver. To compile this driver as a module, choose M here: the module will be called acpi_memhotplug. config ACPI_SBS tristate "Smart Battery System" depends on X86 select POWER_SUPPLY help This driver supports the Smart Battery System, another type of access to battery information, found on some laptops. To compile this driver as a module, choose M here: the modules will be called sbs and sbshc. config ACPI_HED tristate "Hardware Error Device" help This driver supports the Hardware Error Device (PNP0C33), which is used to report some hardware errors notified via SCI, mainly the corrected errors. config ACPI_CUSTOM_METHOD tristate "Allow ACPI methods to be inserted/replaced at run time" depends on DEBUG_FS default n help This debug facility allows ACPI AML methods to be inserted and/or replaced without rebooting the system. For details refer to: Documentation/acpi/method-customizing.txt. NOTE: This option is security sensitive, because it allows arbitrary kernel memory to be written to by root (uid=0) users, allowing them to bypass certain security measures (e.g. if root is not allowed to load additional kernel modules after boot, this feature may be used to override that restriction). config ACPI_BGRT bool "Boottime Graphics Resource Table support" depends on EFI && X86 help This driver adds support for exposing the ACPI Boottime Graphics Resource Table, which allows the operating system to obtain data from the firmware boot splash. It will appear under /sys/firmware/acpi/bgrt/ . config ACPI_REDUCED_HARDWARE_ONLY bool "Hardware-reduced ACPI support only" if EXPERT def_bool n help This config item changes the way the ACPI code is built. When this option is selected, the kernel will use a specialized version of ACPICA that ONLY supports the ACPI "reduced hardware" mode. The resulting kernel will be smaller but it will also be restricted to running in ACPI reduced hardware mode ONLY. If you are unsure what to do, do not enable this option. source "drivers/acpi/apei/Kconfig" config ACPI_EXTLOG tristate "Extended Error Log support" depends on X86_MCE && X86_LOCAL_APIC select UEFI_CPER select RAS default n help Certain usages such as Predictive Failure Analysis (PFA) require more information about the error than what can be described in processor machine check banks. Most server processors log additional information about the error in processor uncore registers. Since the addresses and layout of these registers vary widely from one processor to another, system software cannot readily make use of them. To complicate matters further, some of the additional error information cannot be constructed without detailed knowledge about platform topology. Enhanced MCA Logging allows firmware to provide additional error information to system software, synchronous with MCE or CMCI. This driver adds support for that functionality with corresponding tracepoint which carries that information to userspace. endif # ACPI