sending the processor to sleep and saving power.
CONFIG_ACPI
- ACPI/OSPM support for Linux is currently under development. As such,
- this support is preliminary and EXPERIMENTAL. Configuring ACPI
- support enables kernel interfaces that allow higher level software
- (OSPM) to manipulate ACPI defined hardware and software interfaces,
- including the evaluation of ACPI control methods. If unsure, choose
- N here. Note, this option will enlarge your kernel by about 120K.
-
- This support requires an ACPI compliant platform (hardware/firmware).
- If both ACPI and Advanced Power Management (APM) support are
- configured, whichever is loaded first shall be used.
-
- This code DOES NOT currently provide a complete OSPM implementation
- -- it has not yet reached APM's level of functionality. When fully
- implemented, Linux ACPI/OSPM will provide a more robust functional
- replacement for legacy configuration and power management
- interfaces, including the Plug-and-Play BIOS specification (PnP
- BIOS), the Multi-Processor Specification (MPS), and the Advanced
- Power Management specification (APM).
-
- Linux support for ACPI/OSPM is based on Intel Corporation's ACPI
- Component Architecture (ACPI CA). The latest ACPI CA source code,
- documentation, debug builds, and implementation status information
- can be downloaded from:
- <http://developer.intel.com/technology/iapc/acpi/downloads.htm>.
-
- The ACPI Sourceforge project may also be of interest:
- <http://sf.net/projects/acpi/>
+ 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 intefaces, 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, whichever is loaded first shall be used.
+
+ The ACPI SourceForge project contains the latest source code,
+ documentation, tools, mailing list subscription, and other
+ information. This project is available at:
+ <http://sourceforge.net/projects/acpi>
+
+ Linux support for ACPI is based on Intel Corporation's ACPI
+ Component Architecture (ACPI CA). For more information see:
+ <http://developer.intel.com/technology/iapc/acpi>
+
+ ACPI is an open industry specification co-developed by Compaq,
+ Intel, Microsoft, Phoenix, and Toshiba. The specification is
+ available at:
+ <http://www.acpi.info>
CONFIG_APM
APM is a BIOS specification for saving power using several different
-CONFIG_ACPI_DEBUG
- The ACPI driver can optionally report errors with a great deal
- of verbosity. Saying Y enables these statements. This will increase
- your kernel size by around 50K.
+CONFIG_ACPI
+ 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.
-CONFIG_ACPI_BUSMGR
- The ACPI Bus Manager enumerates devices in the ACPI namespace, and
- handles PnP messages. All ACPI devices use its services, so using
- them requires saying Y here.
+ Linux ACPI provides a robust functional replacement for several
+ legacy configuration and power management intefaces, 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, whichever is loaded first shall be used.
+
+ The ACPI SourceForge project contains the latest source code,
+ documentation, tools, mailing list subscription, and other
+ information. This project is available at:
+ <http://sourceforge.net/projects/acpi>
-CONFIG_ACPI_SYS
- This driver will enable your system to shut down using ACPI, and
- dump your ACPI DSDT table using /proc/acpi/dsdt.
+ Linux support for ACPI is based on Intel Corporation's ACPI
+ Component Architecture (ACPI CA). For more information see:
+ <http://developer.intel.com/technology/iapc/acpi>
-CONFIG_ACPI_CPU
- 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.
+ ACPI is an open industry specification co-developed by Compaq,
+ Intel, Microsoft, Phoenix, and Toshiba. The specification is
+ available at:
+ <http://www.acpi.info>
+
+CONFIG_ACPI_BOOT
+ This option enables the use of ACPI tables for obtaining various
+ boot-time configuration information such as system processors,
+ memory, and interrupt routing.
+
+ ACPI tables supercede legacy BIOS interfaces. For example, the
+ Multiple APIC Description Table (MADT) defined by the ACPI
+ Specification is a replacement for the MP Configuration Table
+ defined by the MultiProcessor Specification (MPS).
+
+ You can disable this feature on IA32 systems by adding "acpi_boot=off"
+ to your kernel command line. (Try "man bootparam" or see the
+ documentation of your boot loader about how to pass options to the
+ kernel at boot time.)
+
+ IA64 systems do not support legacy BIOS interfaces and thus rely
+ on ACPI tables to boot the system. No kernel command line options
+ are supported.
+
+CONFIG_ACPI_INTERPRETER
+ The ACPI Interpreter (a.k.a. ACPI Core Subsystem) provides the
+ fundamental services required to parse the ACPI namespace, evaluate
+ control methods, and manage ACPI hardware and events. This
+ subsystem exposes kernel interfaces allowing higher level software
+ to manipulate ACPI defined hardware and software interfaces.
+
+ Add "acpi=off" to the kernel command line to disable this feature.
+ (Try "man bootparam" or see the documentation of your boot loader
+ about how to pass options to the kernel at boot time.)
+
+ Note that this option will enlarge your kernel by about 100K.
+
+CONFIG_ACPI_BUS
+ The ACPI Bus driver enumerates and manages devices in the ACPI
+ namespace in a manner similar to other bus drivers (e.g. PCI).
+ All ACPI device drivers rely on its services.
+
+CONFIG_ACPI_AC
+ This driver adds support for the AC Adapter object, which indicates
+ whether a system is on AC, or not. Typically, only laptops have
+ this object, since desktops are always on AC.
+
+CONFIG_ACPI_BATTERY
+ This driver adds support for battery information through
+ /proc/acpi/battery. If you have a laptop with a battery, say Y.
CONFIG_ACPI_BUTTON
This driver registers for events based on buttons, such as the
down the system. Until then, you can cat it, and see output when
a button is pressed.
-CONFIG_ACPI_AC
- This driver adds support for the AC Adapter object, which indicates
- whether a system is on AC, or not. Typically, only laptops have
- this object, since desktops are always on AC.
+CONFIG_ACPI_DEBUG
+ The ACPI driver can optionally report errors with a great deal
+ of verbosity. Saying Y enables these statements. This will increase
+ your kernel size by around 50K.
CONFIG_ACPI_EC
This driver is required on some systems for the proper operation of
the battery and thermal drivers. If you are compiling for a laptop,
say Y.
-CONFIG_ACPI_CMBATT
- This driver adds support for battery information through
- /proc/acpi/battery. If you have a laptop with a battery, say Y.
+CONFIG_ACPI_PCI
+ This option enables ACPI-based enumeration and configuration of PCI
+ root bridge devices, including PCI interrupt routing (_PRT) support.
+ This is required on platforms that no longer support legacy tables
+ (e.g. MPS/PIR) or have erroneous table entries.
+
+CONFIG_ACPI_PROCESSOR
+ 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.
CONFIG_ACPI_THERMAL
- This driver handles overheating conditions on laptops. It is HIGHLY
- recommended, as your laptop CPU may be damaged without it.
+ This driver adds support for 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.
+
+CONFIG_ACPI_FAN
+ This driver adds support for ACPI fan devices, allowing user-mode
+ applications to perform basic fan control (on, off, status).
+
+CONFIG_ACPI_SYSTEM
+ This driver will enable your system to shut down using ACPI, and
+ dump your ACPI DSDT table using /proc/acpi/dsdt.
+CONFIG_ACPI_SLEEP
+ Enables low-level sleep support, allowing the platform to enter
+ and exit the S1-S4 states. Note that although the platform may
+ support this capability, full sleep support will not be viable
+ until drivers properly save/restore hardware context. (In other
+ words, use at your own risk!)
projects / linux / commitdiff