These four states are selected automatically by the X server according to the length of
time since the last user input. When the server detects mouse or keyboard activity,
the display state is changed to On.
DPMS is enabled on a monitor-by-monitor basis by adding an option to the Monitor
section of the config file:
Option "DPMS"
Once that is done, the length of time before the Standby, Suspend, and Off states are
activated is specified in the ServerFlags or ServerLayout sections:
Option "StandbyTime" "8"
Option "SuspendTime" "12"
Option "OffTime" "16"
The times specified are in minutes. There??™s also a similar-but-unrelated BlankTime
option, which controls when the screensaver will blank the screen, but that doesn??™t
save any energy.
Unfortunately, the Gnome and KDE environments change these settings
at desktop startup to values entered to their control panels, so
there is little value in setting these times in the xorg.conf file when
using these desktops, except that the xorg.conf settings may have effect
before a user is logged in.
It??™s possible to change these times on-the-fly or disable DPMS entirely using xset,
which is handy during software demonstrations. xset also permits you to immediately
enter a particular state, which is mainly useful for testing.
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