Auto Brightness not working on 3gs ios 6.1.2

I'm using auto brightness from the very biginning of using iPhone....It works good before...But now a days I'm facing a problem..My phone get brighter under light,but it does not get dim when I goes in dark enviroment....I followed the way to set auto brightness from some video tutorial from you tube,I saw the slider moves according to light source.But not working for me....Is this a bug of ios 6.1.2 or am I only suffering from this...
Plz Some1 Help Me or Suggest for what to do.....

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Auto Brightness not working on 3gs ios 6.1.2

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