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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2008-07-24 06:28:36 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-24 19:47:23 +0200 |
| commit | 40b4ac33b4d1bdd5cbeb2241be2399c550fa3696 (patch) | |
| tree | c142b4ac7d4b0cd444ccdbeea4aa7d7ef4f2c23b /Documentation/power/apm-acpi.txt | |
| parent | pm: remove remaining obsolete definitions from pm.h (diff) | |
| download | linux-40b4ac33b4d1bdd5cbeb2241be2399c550fa3696.tar.xz linux-40b4ac33b4d1bdd5cbeb2241be2399c550fa3696.zip | |
pm: remove obsolete piece of PM documentation
Remove some obsolete PM documentation.
The majority of contents of Documentation/power/pm.txt are
outdated. Remove the outdated parts of this file and move the rest
to Documentation/power/apm-acpi.txt . Update the index in
Documentation/power/ as appropriate.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/power/apm-acpi.txt')
| -rw-r--r-- | Documentation/power/apm-acpi.txt | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/Documentation/power/apm-acpi.txt b/Documentation/power/apm-acpi.txt new file mode 100644 index 000000000000..1bd799dc17e8 --- /dev/null +++ b/Documentation/power/apm-acpi.txt @@ -0,0 +1,32 @@ +APM or ACPI? +------------ +If you have a relatively recent x86 mobile, desktop, or server system, +odds are it supports either Advanced Power Management (APM) or +Advanced Configuration and Power Interface (ACPI). ACPI is the newer +of the two technologies and puts power management in the hands of the +operating system, allowing for more intelligent power management than +is possible with BIOS controlled APM. + +The best way to determine which, if either, your system supports is to +build a kernel with both ACPI and APM enabled (as of 2.3.x ACPI is +enabled by default). If a working ACPI implementation is found, the +ACPI driver will override and disable APM, otherwise the APM driver +will be used. + +No, sorry, you cannot have both ACPI and APM enabled and running at +once. Some people with broken ACPI or broken APM implementations +would like to use both to get a full set of working features, but you +simply cannot mix and match the two. Only one power management +interface can be in control of the machine at once. Think about it.. + +User-space Daemons +------------------ +Both APM and ACPI rely on user-space daemons, apmd and acpid +respectively, to be completely functional. Obtain both of these +daemons from your Linux distribution or from the Internet (see below) +and be sure that they are started sometime in the system boot process. +Go ahead and start both. If ACPI or APM is not available on your +system the associated daemon will exit gracefully. + + apmd: http://worldvisions.ca/~apenwarr/apmd/ + acpid: http://acpid.sf.net/ |