My screen recently started having brightness issues. At about half brightness the screen stays the same, there's barely any change to how bright it gets. Adaptive brightness is off, power saving is off, I restarted the phone in safety mode multiple times, i removed the screen protector I had on and ran all the diag tests. The super brightness mode doesn't work - max brightness is essentially the same as 50 or 75%
There is some sort of safety trigger. If the device gets warm, the brightness goes to 50% and it doesn't matter what you try, it will stay that way until it cools down. This is a design flaw and Samsung needs to start addressing this. The phone is useless under FL sunlight. Please don't advice to use autobrightness and other settings bacause that is not the root cause.