Dell C8621QT User Manual page 48

OSD Warning Messages
When the display does not support a particular resolution mode, you can see the following
message:
This means that the display cannot synchronize with the signal that it is receiving from
the computer. See Display Specifications
addressable by this display. Recommended mode is 3840 x 2160.
You can see the following message before the DDC/CI function is disabled:
When the display enters the Power Save mode, the following message appears:
48 | Operating the Display
Dell 86 Monitor
The current input timing is not supported by the monitor display.
Please change your input timing to
monitor listed timing as per the monitor specifications.
for the Horizontal and Vertical frequency ranges
Dell 86 Monitor
The function of adjusting display setting using PC application will be
disabled.
Do you wish to disable DDC/CI function?
Yes
Dell 86 Monitor
Entering power save mode.
3840 x 2160, 60Hz or any other
C8621QT
No
C8621QT