[ubuntu] ATI driver and mouse problem

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http://ubuntuforums.org – Hello everyone, I struggled installing ubuntu 12.10 x64 on my machine with two ATI 6950. Since i managed to login and install the fglrx in the repository I have many troubles. There's this strange behavious of the mouse which is surrounded by some kind of square/background which draws older windows. This picture is much more eloquent than me. Moreover both Tearfree and Crossfire don't work. Thanks a lot (Hardware)