Many would notice that the auto-brightness appears to not work properly anymore after updating to iOS 6. Apple Developers actually made some changes to the auto brightness function and it behaves differently compared to previous iOS version.
In some cases, a simple calibration may be required for the auto brightness to work properly.
Here’s how:
1. Set auto brightness slider to minimum.
2. Turn auto-brightness to OFF and set it ON again.
The auto-dim feature got significantly improved in iOS 6. The best improvement is brightness adjustment in the lock screen.
Previously, in a dark room, you need to constantly adjust the iPad or iPhone’s default brightness before sliding to unlock and having it dim down to match the room’s brightness. However with iOS 6, the moment the screen turns on, the brightness is set appropriately.
In all previous versions of iOS, the light sensor would sense the room’s brightness and then drastically adjusts the brightness. iOS 6 auto-brightness adjustment is gradual and much more subtle