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On a typical LCD, a black screensaver is actually worse for power consumption than a normal screen, because it takes more energy to turn the crystals opaque. Also, the intermediate DPMS states are essentially useless and most monitors alias them to the 'off' state, so we may as well do the same. As a pleasant side effect, this brings the default DPMS timeouts in line with the EnergyStar Program Requirements for Computers: http://www.energystar.gov/index.cfm?c=revisions.computer_spec which state that products must be "shipped with the display's Sleep mode set to activate within 15 minutes of user inactivity".