Dell UltraSharp U4919DW User Manual page 59

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Display Info Displays the monitor's current settings.
DDC/CI DDC/CI (Display Data Channel/Command Interface)
allows your monitor parameters (brightness, color
balance, and etc.) to be adjustable via the software on
your computer.
You can disable this feature by selecting Off.
Enable this feature for best user experience and
optimum performance of your monitor.
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Operating the Monitor 59