Advanced Power Management (
APM) is a feature of some computer displays, usually but not always, on
laptop computers, which turns off power to the display after a preset period of inactivity to conserve electrical power.
Monitors with this capability are usually referred to as "green monitors", meaning environmentally friendly.
Not to be confused with a screensaver which is software that causes the display to go black (by setting every pixel to black) to prevent burn-in.
see also ACPI
This article (or an earlier version of it) contains material from FOLDOC, used with permission.