Please collect a full backtrace - see http://wiki.ubuntu.com/X/Backtracing for directions.
Also, if you could attach your lspci -vvnn output and Xorg.0.log that would be of use.
Please collect a full backtrace - see http:// wiki.ubuntu. com/X/Backtraci ng for directions.
Also, if you could attach your lspci -vvnn output and Xorg.0.log that would be of use.