bug 315422 is a dupe of 146859. Perhaps this bug is as well.
Thomas, please attach your /var/log/Xorg.0.log, /var/log/Xorg.0.log, /etc/X11/xorg.conf, and the output of 'lspci -vvnn'. Those are always required when reporting X bugs. Also attach the output of 'xrandr --verbose'.
If in your Xorg.0.log you have an error "Cannot support DRI with frame buffer width > 2048." it means you just have a dupe of 146859 too.
bug 315422 is a dupe of 146859. Perhaps this bug is as well.
Thomas, please attach your /var/log/ Xorg.0. log, /var/log/ Xorg.0. log, /etc/X11/xorg.conf, and the output of 'lspci -vvnn'. Those are always required when reporting X bugs. Also attach the output of 'xrandr --verbose'.
If in your Xorg.0.log you have an error "Cannot support DRI with frame buffer width > 2048." it means you just have a dupe of 146859 too.