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[Christoph <1425891@xxxxxxxxxxxxxxxxxx>]

I upgraded to the LTS stack and now firefox loads the mentioned URLs
without Xorg freezing the desktop. Thank you very much for your help.

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https://bugs.launchpad.net/bugs/1425891

Title:
  Xorg radeon freezes if firefix loads big images

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  If I open each of this URLs

  http://canon-premium.webcdn.stream.ne.jp/www09/canon-premium/eosd/samples/eos5dsr/downloads/02.jpg
  http://canon-premium.webcdn.stream.ne.jp/www09/canon-premium/eosd/samples/eos5ds/downloads/02.jpg

  in a firefox 36.0 on a Xorg Server of 1.15.1 with a R9 270 and a
  Ubuntu 14.04.1  AMD64 the desktop freezes. I can only move the mouse
  pointer, although the the login via SSH is still possible and works
  fine. By restarting the Xorg Server I can gain control over the local
  terminal again.

  This happens with the radeon driver, but not with the fglrx driver.
  The problem did not manifest itself with other applications.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.13.0-45.74-generic 3.13.11-ckt13
  Uname: Linux 3.13.0-45-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Thu Feb 26 11:19:49 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Curacao PRO [Radeon R9 270] [1002:6811] (prog-if 00 [VGA controller])
     Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:3050]
  InstallationDate: Installed on 2014-04-22 (309 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-45-generic root=UUID=e0df56bb-b5a5-4b2c-9f89-ce5ff2e3b019 ro quiet splash
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  XorgLogOld:
   
  dmi.bios.date: 12/17/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.70
  dmi.board.name: Z97 Extreme6
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.70:bd12/17/2014:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ97Extreme6:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  version.compiz: compiz 1:0.9.11.3+14.04.20150122-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1~ubuntu2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.3
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Thu Feb 26 11:18:17 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.15.1-0ubuntu2.7
  xserver.video_driver: radeon

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