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After I've installed Ubuntu 12.04 my graphic card driver wasn't recognized. To fix this

I've installed "mesa-utils" package and my graphic driver now it's recognized.

On browsers (Chrome, Firefox), I have the impression that the images are a little bit pixelated, but just only in browsers because when I'm using a image viewer app the images seems to render proper. Is there a way to check if my graphic card is the right one and it's working proper? Thanks!

Later edit: I'm using a Lenovo B570e model.

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For intel cards (I saw the tags) see here => askubuntu.com/questions/225356/… and test and tell me if you see any improvement. –  NikTh Dec 14 '12 at 21:38
    
I think I've already had that sna acceleration because I've added it and don't see any change. Thanks! –  Alecs Dec 15 '12 at 18:25
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