How to fix auto-brightness issues with iOS 6
Ambient light sensor readings got quite a bit of an overhaul in iOS 6, and now include Lock screen auto-brightness and better memory management. This has lead to many people experiencing issues with auto-brightness settings. iPhone 5 users in particular seem to be having trouble. If your auto-brightness isn't working under iOS 6, here's how to reset it and get it back in gear.
- Go into a dimly lit or dark room.
- Launch the Settings app from the Home screen of your iPhone, iPad, or iPod touch.





As long as the brightness slider is moving on its own, you have successfully re-calibrated the sensor and it should work properly from here on out.
Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/eKO6s9GrTKM/story01.htm
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