Dell S2719DC User Manual page 33

OSD warning messages
When the Dynamic Contrast feature is enabled in preset modes (Game or Movie), manual
brightness adjustment is disabled, the following message is displayed.
When the monitor does not support a particular resolution mode, the following message is
displayed.
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
supported by this monitor. Recommended resolution is 2560 x 1440.
You can see the following message before the DDC/CI function is disabled.
Operating the monitor | 33