Someone posted a fix for this. I don't know if it's purely psychological but it definitely worked for me:
Put your brightness to 50% and toggle on auto brightness while in a normally lit room. Then go to a light or lamp and face the front of the screen directly to the light source and wait for the brightness level to automatically move up to 100%. Then return to the normally lit room and wait for it to go back down to 50%. Check results.
Lol