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[Launchpad Bug Tracker <1318119@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xorg-server - 2:1.15.1-0ubuntu2.6

---------------
xorg-server (2:1.15.1-0ubuntu2.6) trusty-proposed; urgency=medium

  [ Laércio de Sousa ]
  * Backport support for logind-based multiseat back to trusty. (LP: #1209008)

  [ Maarten Lankhorst ]
  * Re-enable support for rotation and transforms on gpu-screens with support.
    - Allows re-enabling intel SNA rotation after fixing it. (LP: #1386620)
  * Fix black screen when using qemu with cirrus vga.
    - fb-24-depth.patch (LP: #1318119)
 -- Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxx>   Mon, 03 Nov 2014 12:36:32 +0100

** Changed in: xorg-server (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1318119

Title:
  14.04 corrupted graphics on cirrus (in qemu) [PATCH available]

Status in xorg-server package in Ubuntu:
  Fix Released
Status in xorg-server source package in Trusty:
  Fix Released
Status in xorg-server source package in Utopic:
  New

Bug description:
  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

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