How to find out if Advanced Power Management on Linux

To find out if Advanced Power Management (APM) is enabled on a Linux system, you can use the dmesg command to check the system logs for messages related to APM. The syntax is as follows:

dmesg | grep APM

This will display all messages in the system logs related to APM. If APM is enabled, you should see messages indicating that APM is detected and initialized.

For example, the output might look something like this:

[    0.000000] APM: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac)
[    0.000000] APM: disabled on user request.

Alternatively, you can use the apm command to display information about the APM status of your system. The syntax is as follows:

apm

This will display a summary of the APM status of your system, including the battery status, remaining battery time, and AC line status.

For example, the output might look something like this:

Battery status:            high
Battery remaining:         100%
AC line status:            on-line

Keep in mind that APM is an optional feature that may or may not be supported by your system, and it may require additional software or hardware support to be used. Consult your system documentation or check with your system administrator to find out more about APM support on your system.