Not sure if this is common for Samsung devices, but max brightness on a TouchWiz ROM is not max brightness. If you are in bright light and switch from max brightness to auto brightness, the screen gets brighter still. Is there any way to disable this with root?
Here's a video explaining what I mean:
youtube.com/watch?v=U4IEHP4p3KA
Here's a video explaining what I mean:
youtube.com/watch?v=U4IEHP4p3KA