HP L156v User Manual page 24

Operating the Monitor
The DDC2B is a bidirectional data channel based on the I²C
protocol. The host can request EDID information over the
DDC2B channel.
THIS MONITOR WILL APPEAR TO BE NON-FUNCTIONAL
IF THERE IS NO VIDEO INPUT SIGNAL. IN ORDER FOR
THIS MONITOR TO OPERATE PROPERLY, THERE MUST
BE A VIDEO INPUT SIGNAL.
This monitor meets the Green monitor standards as set by the
Video Electronics Standards Association (VESA) and/or the
United States Environmental Protection Agency (EPA) and The
Swedish Confederation Employees (NUTEK). This feature is
designed to conserve electrical energy by reducing power
consumption when there is no video-input signal present. When
there is no video input signal this monitor, following a time-out
period, will automatically switch to an OFF mode. This reduces
the monitor's internal power supply consumption. After the video
input signal is restored, full power is restored and the display is
automatically redrawn. The appearance is similar to a "Screen
Saver" feature except the display is completely off. The display is
restored by pressing a key on the keyboard, or clicking the mouse.
4–10 User Guide