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macOS Catalina brightness control not working

I have a 27" late-model 2012 iMac configured for manual brightness adjustment. Starting with the Catalina update the display's brightness goes to the max when logging into the machine and then I have to lower the brightness to the desired level.


I tried letting the system adjust brightness automatically but I do not like how that works.


I prefer a constant brightness but macOS ignores my settings.


I have done a PRAM and SMC reset but that did not help.


Any ideas about what is going on?

Posted on Jan 1, 2020 10:12 PM

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macOS Catalina brightness control not working

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