Dell UltraSharp U2424H User Manual page 91

When you adjust the Brightness level for the first time, the following message
appears:
NOTE: If Yes is selected, the message will not appear next time you
intend to change the Brightness setting.
When Auto Brightness is enabled, if you adjust the brightness level, the following
message appears:
NOTE: If Yes is selected, Auto Brightness will be disabled.
Operating the monitor
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