Comment 2 for bug 154537

Can you please test this package to see if it makes a difference?

http://people.ubuntu.com/~bryce/Testing/xorg-server/xserver-xorg-core_1.3.0.0.dfsg-12ubuntu9~bwh1_i386.deb

Also, please attach your /var/log/Xorg.0.log, /etc/X11/xorg.conf, and the output of lspci -vvnn