Where do you see a actual percentage. I was only guessing the 2% almost down to end, and the 35 or whatever also a guess when I turn my lights back on (its night and dark here)You only adjust the brightness in pitch black and that becomes the reference brightness. Then auto brightness will adjust based on the reference brightness. In my case I set the reference brightness to 2%. When I am in a lighted room, the brightness goes to 35% on its own. This will actually save battery life because it is not necessary to have the brightness always at one value, say 35%. Brightness adjusts down in the dark, that saves battery life.