Dell U2422H 23.8" 16:9 IPS Monitor - Manual (Page 37)

Setting Up the Monitor
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37
Connecting the DisplayPort (DisplayPort to DisplayPort) Cable
NOTE: The default out of factory setting is DP1.4 (DP1.2 is supported).
If the monitor fails to show any content after the DisplayPort cable is
connected, follow the procedures below to change the settings to
DP1.1:
• Press the Joystick to open the Menu Launcher.
• Toggle the Joystick to select Input Source .
• Toggle the Joystick to highlight DP .
• Press and hold the Joystick for approximately 10 seconds, and the DisplayPort
configuration message appears.
• Toggle the Joystick to select Yes and then press the Joystick to save the
changes.
Repeat the above steps to change the DisplayPort format settings if
necessary.