I got this a lot with Kernel: 3.5.0-26-generic and used a quick workround to avoid the problem: http://askubuntu.com/questions/225356/how-can-i-enable-the-sna-acceleration-method-for-intel-cards-under-ubuntu-12-04
SNA does not seem to have the same issue just UXA. If I have time I can try a new kernel but I spent so much time on this already it may be a few days before I get the time to try the new kernel.
I got this a lot with Kernel: 3.5.0-26-generic and used a quick workround to avoid the problem: http:// askubuntu. com/questions/ 225356/ how-can- i-enable- the-sna- acceleration- method- for-intel- cards-under- ubuntu- 12-04
SNA does not seem to have the same issue just UXA. If I have time I can try a new kernel but I spent so much time on this already it may be a few days before I get the time to try the new kernel.