Auto brightness on iPhone 4S suddenly stopped working?

Just today everything with my phone was fine. An all of a sudden for no reason the screen was just dim. I tried turning the auto brightness on and off, shutting the phone off, calibrating it. Nothing works… So now I have to have my phone bright all the time.

Anyone know how to fix it?

Must be a bug. The Auto brightness option always sucked on the iPhones.

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