Acer K650i SERIES User Manual page 30

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Choosing "Yes" returns the display parameters on this menu
Reset
to the factory default settings.
Note: "H. Position", "V. Position", "Frequency" and "Tracking" functions
are not supported under video mode.
Note: "HDMI Color Range" and "HDMI Scan Info" are only available when
the input signal is HDMI.