Looking further it seems that the root cause is that the CIRRUS driver cannot be used in 12.04.3 because of this
[ 579.647] (EE) cirrus: The PCI device 0xb8 at 00@00:02:0 has a kernel module claiming it. [ 579.647] (EE) cirrus: This driver cannot operate until it has been unloaded. It seems that this is caused by the DRM driver: [ 579.639] (II) config/udev: Adding drm device (/dev/dri/card0) [ 579.642] (--) PCI:*(0:0:2:0) 1013:00b8:1af4:1100 rev 0, Mem @ 0xfc000000/33554432, 0xfebf0000/4096, BIOS @ 0x????????/65536 The DRM driver is not presend/loaded in Ubuntu 12.04.2. Subsequently the CIRRUS module loads fine and the graphic is working as expected. I will try if the resolution for this bug here fixes the problem: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/982889 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-cirrus in Ubuntu. https://bugs.launchpad.net/bugs/1080674 Title: [QEMU] Corrupted desktop screen for raring desktop installation in QEMU guest (Cirrus graphics). Affects KVM but not VBox. To manage notifications about this bug go to: https://bugs.launchpad.net/cairo/+bug/1080674/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
