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CONFIG_APM_EMULATION: Advanced Power Management Emulation

General informations

The Linux kernel configuration item CONFIG_APM_EMULATION:

Help text

APM is a BIOS specification for saving power using several different techniques. This is mostly useful for battery powered laptops with APM compliant BIOSes. If you say Y here, the system time will be reset after a RESUME operation, the /proc/apm device will provide battery status information, and user-space programs will receive notification of APM "events" (e.g. battery status change).

In order to use APM, you will need supporting software. For location and more information, read Documentation/power/apm-acpi.txt and the Battery Powered Linux mini-HOWTO, available from

This driver does not spin down disk drives (see the hdparm(8) manpage ("man 8 hdparm") for that), and it doesn't turn off VESA-compliant "green" monitors.

Generally, if you don't have a battery in your machine, there isn't much point in using this driver and you should say N. If you get random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS).



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