i don't know if it can help, there is that bug "DRI2: (UXA) white transparency artifacts with compiz" pending in Ubuntu https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/324854
i don't know if it can help, there is that bug "DRI2: (UXA) white transparency artifacts with compiz" pending in Ubuntu https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/324854