Download OEM software from the website and it will automatically update your driver or notify you about it.Go to Windows Update > Advanced Options >Optional updates > Driver Download, and install if there is one available for you. Reinstalling the drivers or moving back to an older version could help in that scenario. Sometimes, brands may push out a buggy update out of nowhere for your monitor or graphic cards. With that, restart our PC once and check whether the missing brightness slider is back, else continue to follow other methods mentioned below.
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