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151f4e2b | 1 | ============ |
40b4ac33 | 2 | APM or ACPI? |
151f4e2b MCC |
3 | ============ |
4 | ||
40b4ac33 RW |
5 | If you have a relatively recent x86 mobile, desktop, or server system, |
6 | odds are it supports either Advanced Power Management (APM) or | |
7 | Advanced Configuration and Power Interface (ACPI). ACPI is the newer | |
8 | of the two technologies and puts power management in the hands of the | |
9 | operating system, allowing for more intelligent power management than | |
10 | is possible with BIOS controlled APM. | |
11 | ||
12 | The best way to determine which, if either, your system supports is to | |
13 | build a kernel with both ACPI and APM enabled (as of 2.3.x ACPI is | |
14 | enabled by default). If a working ACPI implementation is found, the | |
15 | ACPI driver will override and disable APM, otherwise the APM driver | |
16 | will be used. | |
17 | ||
18 | No, sorry, you cannot have both ACPI and APM enabled and running at | |
19 | once. Some people with broken ACPI or broken APM implementations | |
20 | would like to use both to get a full set of working features, but you | |
21 | simply cannot mix and match the two. Only one power management | |
22 | interface can be in control of the machine at once. Think about it.. | |
23 | ||
24 | User-space Daemons | |
25 | ------------------ | |
26 | Both APM and ACPI rely on user-space daemons, apmd and acpid | |
27 | respectively, to be completely functional. Obtain both of these | |
28 | daemons from your Linux distribution or from the Internet (see below) | |
29 | and be sure that they are started sometime in the system boot process. | |
30 | Go ahead and start both. If ACPI or APM is not available on your | |
31 | system the associated daemon will exit gracefully. | |
32 | ||
151f4e2b MCC |
33 | ===== ======================================= |
34 | apmd http://ftp.debian.org/pool/main/a/apmd/ | |
35 | acpid http://acpid.sf.net/ | |
36 | ===== ======================================= |