Dell U2913WM User Manual page 34

NOTE: In most cases, Auto Adjust produces the best image for your configuration.
NOTE: Auto Adjust option is only available when you are using the analog (VGA) connector.
Input Source Use the Input Source menu to select between different video signals that may be connected to your monitor.
VGA
Select VGA input when you are using the analog (VGA) connector. Press the
DVI-D
Select DVI-D input when you are using the Digital (DVI) connector. Press the
DisplayPort
Select DisplayPort input when you are using the DisplayPort (DP) connector. Press the
to select the VGA input source.
to select the DVI input source.
to select the DisplayPort input source.