Dell UltraSharp 49 U4924DW 49" WQHD Ultrawide Curved Monitor - Manual (Page 79)

Operating the monitor
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79
OSD warning message
When the monitor does not support a particular resolution mode, you will see the
following message:
This means that the monitor cannot synchronize with the signal that it is receiving
from the computer. See
Monitor specifications for the Horizontal and Vertical
frequency ranges addressable by this monitor. Recommended mode is 5120 x 1440.
Factory Reset Restore all preset values to the factory default
settings. These are also the settings for ENERGY
STAR
®
tests.