Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 31)

Setting up the monitor
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3. Connect the DisplayPort, HDMI, or USB Type-C cable from your monitor to
the computer.
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 launch the Menu Launcher.
• Move the joystick up to select and activate the OSD main menu.
• Toggle the joystick to highlight Input Source , then press the joystick button
to enter the submenu.
• Toggle the joystick to highlight DP .
• Press and hold the joystick for approximately 8 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.