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.
- Tap on Brightness & Wallpaper.
- Turn the auto-brightness setting to Off.
- Adjust the brightness slider to the level you would like your screen brightness to be at in the given environment. For instance, if you're in a completely dark room, you'll probably want to put the slider all the way to low or pretty close to all the way down.
- Turn the auto-brightness setting to On again.
- Now flip on a light switch.
- Watch the brightness slider move upwards to adjust to the new light entering the sensor.
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.
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Source: http://feedproxy.google.com/~r/TheIphoneBlog/~3/eKO6s9GrTKM/story01.htm
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