Maybe it is a hardware issue. I have found this forum entry: http://ubuntuforums.org/showpost.php?s=94a6397d6d2d8032f3d29eb219f7c78d&p=4390181&postcount=8 . Could you please attach the output of lspci -vvnn and your /var/log/Xorg.0.log ?
Maybe it is a hardware issue. I have found this forum entry: http:// ubuntuforums. org/showpost. php?s=94a6397d6 d2d8032f3d29eb2 19f7c78d& p=4390181& postcount= 8 .
Could you please attach the output of lspci -vvnn and your /var/log/Xorg.0.log ?