Advanced Power Management
<hardware> (APM) A feature of some 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 refered to as "green monitors", meaning environmentally friendly.
Not to be confused with a screen blanker which is software that causes the
display to go black (by setting every pixel to black) to prevent burn-in.
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