Auto brightness not working in ios6

I updated my iPad (3rd gen) to ios6, but when the update is complete i found that the auto brightness not working, when i use the ipad on dark room the brightness not changing, when i use ios5.1 it changing.. Any solution and actually the problem is on ios or in the hardware? Looking for help asap...

Well my device is different and since it is a iPhone 5, it is not being updated to iOS 6 but the issue is exactly the same. From my mind this could be up to software but also could be from an hardware issue. The thing is that even if it worked before iOS 6 for you the new software could have revealed hardware conflicts since the software interacts different with the hardware for some features. This would be the worst case scenario because I know that normally iPhone 4 devices if not the 8GB model will be out of warranty. For me this is just a small issue since my warranty is still one year :(
I have contacted apple care for this issue and have get the info that it will be escalated to the engineering team, for further investigation. As I know there was also an issue with some proximity sensors at the beginning if the iPhone 4 models and I think there was an software fix for a lot of them. Hope for the best!!!
I have also done a lot of Troubleshooting, reseted settings, content and settings, restored in dfu and recovery mode, restored with new .ipsw (iPhone OS), restored on different pc (so even this step gas downloaded a totally new .ipsw file), first on a Mac!
Next step wis that I will let the battery drain low entirely, a Troubleshooting idea of an friend. This might empower the entire hardware for a restart. I am not really believing in this step but I will give it a try :)

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