Public bug reported: Running 14.04 LTS inside of qemu-kvm with its emulated cirrus gpu that uses 24bpp frontbuffers causes broken rendering. 12.04 LTS worked fine with no corruption on the same qemu-kvm host.
RHEL7 public beta had the same problem (https://bugzilla.redhat.com/show_bug.cgi?id=1074106). RHEL7 Release Candidate applied this patch: http://patchwork.freedesktop.org/patch/18244/ >From the patch: "So we have 2 places where gpus with 24bpp frontbuffers are still in use, cirrus (in qemu) and some early variants of the mgag200 server chips. Currently we seem to get a lot of broken rendering in qt, mesa, gnome if we expose the frontbuffer as 24bpp, nobody seems to test this anymore upstream so client side apps are constantly broken, so lets just make -modesetting expose a 24/32 shadow frontbuffer, and use the shadow update hook to convert down to the actual 24bpp front, this might be slower, but its correct and really anyone that wants this already has enough problems." Ubuntu version: 14.04 LTS Effected version: xserver-xorg-video-modesetting-0.8.1-1build1 ** Affects: xserver-xorg-video-modesetting (Ubuntu) Importance: Undecided Status: New ** Attachment added: "screenshot of corrupted graphics" https://bugs.launchpad.net/bugs/1318119/+attachment/4109064/+files/u1404-modesetting-corrupted-graphics.png -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-modesetting in Ubuntu. https://bugs.launchpad.net/bugs/1318119 Title: corrupted graphics on cirrus (in qemu) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-modesetting/+bug/1318119/+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
