Dell U2422H 23.8" 16:9 IPS Monitor - Manual (Page 60)

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Operating the Monitor
Input Source Selects between the different video signals that may
be connected to your monitor.
For U2422H/U2422H WOST/U2422HX:
For U2422HE:
DP Select the DP input when you are using the
DisplayPort (DP) connector . Press the Joystick
to confirm the selection.
HDMI Select the HDMI input when you are using the HDMI
connector . Press the Joystick to confirm the
selection.