mirror of
https://github.com/adulau/aha.git
synced 2024-12-29 12:16:20 +00:00
33 lines
1.5 KiB
Text
33 lines
1.5 KiB
Text
|
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/
|