0001 ============
0002 APM or ACPI?
0003 ============
0004
0005 If you have a relatively recent x86 mobile, desktop, or server system,
0006 odds are it supports either Advanced Power Management (APM) or
0007 Advanced Configuration and Power Interface (ACPI). ACPI is the newer
0008 of the two technologies and puts power management in the hands of the
0009 operating system, allowing for more intelligent power management than
0010 is possible with BIOS controlled APM.
0011
0012 The best way to determine which, if either, your system supports is to
0013 build a kernel with both ACPI and APM enabled (as of 2.3.x ACPI is
0014 enabled by default). If a working ACPI implementation is found, the
0015 ACPI driver will override and disable APM, otherwise the APM driver
0016 will be used.
0017
0018 No, sorry, you cannot have both ACPI and APM enabled and running at
0019 once. Some people with broken ACPI or broken APM implementations
0020 would like to use both to get a full set of working features, but you
0021 simply cannot mix and match the two. Only one power management
0022 interface can be in control of the machine at once. Think about it..
0023
0024 User-space Daemons
0025 ------------------
0026 Both APM and ACPI rely on user-space daemons, apmd and acpid
0027 respectively, to be completely functional. Obtain both of these
0028 daemons from your Linux distribution or from the Internet (see below)
0029 and be sure that they are started sometime in the system boot process.
0030 Go ahead and start both. If ACPI or APM is not available on your
0031 system the associated daemon will exit gracefully.
0032
0033 ===== =======================================
0034 apmd http://ftp.debian.org/pool/main/a/apmd/
0035 acpid http://acpid.sf.net/
0036 ===== =======================================
