Looking at your lspci.txt and the xorg-video-driver you've an ATI GPU in your system. What you're seeing is a bug in the xserver-xorg-video-ati when using the XAA acceleration-method. Be sure to switch to EXA (in xorg.conf). I'm reassigning this to xserver-xorg-video-ati. It's a known bug and therefore also a duplicate of LP: #429295.
Looking at your lspci.txt and the xorg-video-driver you've an ATI GPU in your system. What you're seeing is a bug in the xserver- xorg-video- ati when using the XAA acceleration- method. Be sure to switch to EXA (in xorg.conf). I'm reassigning this to xserver- xorg-video- ati. It's a known bug and therefore also a duplicate of LP: #429295.