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[Paul Donohue <ubuntu@xxxxxxxxxx>]

I've been running 3.8.0-28.41 from -proposed for a few days now, and it
appears to have corrected this issue for me.

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https://bugs.launchpad.net/bugs/1200126

Title:
  coherency bug in drm/i915. Please apply patch to kernel

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Raring:
  Fix Committed
Status in “linux” source package in Saucy:
  Fix Released

Bug description:
  There is a known coherency bug in kernels after 3.7 affecting all
  intel gen4 hardware.

  Bug has been patched in devel kernel and flagged for inclusion in
  3.10.1.

  Please, let this patch be available on ubuntu raring 3.8 series.

  Patch details:

  commit 22fd5ca947b58901927d100d2b1aa0f1672b3435
  Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
  Date:   Fri Jun 28 16:54:08 2013 +0100

      drm/i915: Only clear write-domains after a successful wait-seqno

  which affects v3.7+.

  
  See also https://bugs.freedesktop.org/show_bug.cgi?id=65665.

  This bug is quite disturbing as it causes large bitmaps to be rendered incorrectly in many apps like firefox, libreoffice, etc.
  Furthermore, it may be the cause of the occasional incorrect rendering of some chars reported in https://bugs.freedesktop.org/show_bug.cgi?id=55500

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image 3.8.0.26.44
  ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2
  Uname: Linux 3.8.0-26-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  callegar   2591 F.... pulseaudio
  CRDA:
   country IT:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (N/A, 20)
   	(5250 - 5330 @ 40), (N/A, 20), DFS
   	(5490 - 5710 @ 40), (N/A, 27), DFS
  Date: Thu Jul 11 10:54:13 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=14fe66c7-7c31-4fdb-9894-de7f5e8eca75
  InstallationDate: Installed on 2009-11-12 (1336 days ago)
  InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  MachineType: Dell Inc. Latitude E6500
  MarkForUpload: True
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-26-generic root=/dev/mapper/group00-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-26-generic N/A
   linux-backports-modules-3.8.0-26-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-05-25 (46 days ago)
  dmi.bios.date: 12/06/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A27
  dmi.board.name: 0W612R
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA27:bd12/06/2011:svnDellInc.:pnLatitudeE6500:pvr:rvnDellInc.:rn0W612R:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: Latitude E6500
  dmi.sys.vendor: Dell Inc.

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