HP 2311gt 23 inch Diagonal 3D LED Monitor - Manual (Page 31)

The monitor also supports a power-saver mode that is controlled by the computer. When the monitor
is in the reduced-power state, the monitor screen is blank, the backlight is off, the Power light is
amber, and the monitor uses minimum power. When the monitor is "awakened," a brief warm-up
period occurs before the monitor returns to normal operating mode. The energy-saving reduced
power state activates if the monitor does not detect either the horizontal sync signal or the vertical
sync signal. The power-saver feature must be activated on your computer for this feature to work.
Refer to your computer documentation for instructions on setting energy-saver features (sometimes
called power-management features).
NOTE: The energy-saver feature works only when the monitor is connected to computers that have
energy-saver features.
ENWW Power-Saver Feature 23