Page "Digital Visual Interface" Paragraph 2
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DVI's digital video transmission format is based on PanelLink, a serial format devised by Silicon Image Inc. PanelLink uses transition minimized differential signaling ( TMDS ), a high-speed serial link developed by Silicon Image.
Like modern analog VGA connectors, the DVI connector includes pins for the display data channel ( DDC ).
A newer version of DDC called DDC2 allows the graphics adapter to read the monitor's extended display identification data ( EDID ).
If a display supports both analog and digital signals in one DVI-I input, each input method can host a distinct EDID.
Since the DDC can only support one EDID, there can be a problem if both the digital and analog inputs in the DVI-I port detect activity.
It is up to the display to choose which EDID to send.
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