Source - ViewSonic IFP32 Series User Manual

Source

Toggle Wake up by active source, Signal auto search, and HDMI CEC and select Input
port auto switch.
Item
Wake up by Active Source
Signal Auto Search
Input Port Auto Switch
Energy Saving
The screen will turn on automatically after plugging in an
HDMI cable when the screen is off.
When enabled, if the current source does not have a signal, the
ViewBoard will automatically search for an input source.
The original signal will automatically switch to a new cable after it's
plugged in.
Set a time period to power off if no signal is detected.
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Description