Display Power Management System (DPMS) is a power management system controlled from the graphics card, a power saving function that is activated when no image changesare detected for a specified time.
The guidelines for the DPMS standard were developed by the Video Electronics Standards Association( VESA). There are three different power off levels: in the first power off level, Standby Mode, the screen is dimmed; in the second level, Suspend, the voltage is greatly reduced; and the third power saving level, Sleep Mode, is associated with turning off the supply voltage from the display.
The time setting for each power saving stage can be configured by the user. DPMS management reduces the power required by monitors with cathode ray tubes from, for example, 150 W in full mode, to 120 W in standby and about 20 W in suspend, to less than 5 W in sleep mode.