Alienware AW2723DF 27" 1440p 280Hz Gaming Monitor (Lunar Light) - Manual (Page 65)

Operating the monitor | 65
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. The recommended mode is 2560
x 1440 .
You will see the following message before the DDC/CI function is disabled:
When you adjust the Brightness level above the default level for the first time,
the following message appears:
NOTE: If you select Yes, the message will not appear the next time you
changes the Brightness setting.