I have turn on automatic-brightness, but it does'nt work. Brightness is all the time same (in dark or at sunny)

Hello,
i have iPhone 4 and i have problem with automatic-brightness. I have turn on automatic-brightness, but it does'nt work. Brightness is all the time same (in dark or at sunny). People says it's firmware error. What to do with this?

Try:                                               
- iOS: Not responding or does not turn on           
- Also try DFU mode after try recovery mode
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
- If not successful and you can't fully turn the iOS device fully off, let the battery fully drain. After charging for an least an hour try the above again.
- Try another cable              
- Try on another computer                                                       
- If still not successful that usually indicates a hardware problem and an appointment at the Genius Bar of an Apple store is in order.
  Apple Retail Store - Genius Bar                              

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