Dell SP2318H User Manual page 50

You will see the following message before the DDC/CI function is disabled:
When the monitor goes into power-save mode, the following message appears:
Activate the computer and wake up the monitor to gain access to the OSD.
If you press any button other than the power button, the following message will
appear depending on the selected input:
NOTE: The message may be slightly different according to the
connected input signal.
If either VGA, HDMI, or DP input is selected and the corresponding cable is not
connected, a floating dialog box as shown below appears.
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50 Operating the Monitor
or