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?