display power management signaling. A standard that defines display power management states and provides a standard method for the display controller to signal to the display to enter into those states.

Display Power Management Signalling - when monitors are not being used, it is a waste of energy to have them on at normal brightness - RISC OS 3 supports screen blanking which helps to reduce energy consumption, but some monitors can accept special electronic signals from a computer to tell it to drop into a very low power consumption mode if it is not being used - this signalling between computer and monitor is not available in all monitors, although a lot of newer monitors are beginning to provide it

DPMS defines four power management modes for monitors: On, Stand-by, Suspend and off. The presence or absence of particular (horizontal and vertical) synchronization signals or the entire video signal indicate to the monitor which power management mode to enter.

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