After some time on my booted KVM/QEMU VM the screen becomes black and a lot of letters becomes invisible (please see screenshot in attachment). Also it could happens quicker if to run firefox, load some web page and to move scrollbar up and down. Sometimes it is even hangs the hole VM if to move scrollbar. Relogin always fixes the screen. Host: Kubuntu 14.10 Linux 3.19RC5 x86_64 libvirt0 1.2.11-0~14.10~ppa1 qemu-system-x86 2.2.0+dfsg-0~14.10~ppa0 Mesa 10.5.0-devel (git-94e7b59 2015-01-24 utopic-oibaf-ppa) xserver-xorg-video-qxl 0.1.1-0ubuntu3 Guest: Xubuntu 14.04.1 x86 Linux: 3.13.0-44 / 3.18.3 / 3.19RC5 x86_64 Mesa 10.5.0-devel (git-d2811c2 2015-01-24 trusty-oibaf-ppa)
Created attachment 112781 [details] dmesg
Created attachment 112782 [details] glxinfo
Created attachment 112783 [details] Xorg.0.log
Created attachment 112784 [details] Screenshot of start menu
Created attachment 112785 [details] Guake screenshot (some letters missing)
This bug still is there. After several seconds a desktop becomes black. You can see it in screenshot.
Created attachment 117662 [details] Black desktop in some seconds
Could be caused by the surface code which is known to be buggy and is disabled in the fedora driver. I don't know if it's enabled or disabled in ubuntu packages.
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