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[Jens <jens-launchpad.net@xxxxxxxxxxxxxxx>]

This seems to have been solved after updating kernel and graphics
drivers to the current LTS version backports.

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https://bugs.launchpad.net/bugs/1319535

Title:
  Desktop animations jitter / stutter under load

Status in Unity:
  New
Status in unity package in Ubuntu:
  New

Bug description:
  The new desktop animations, fading etc. of windows is great. However,
  unlike with 12.04, all these animations - and in fact every action on
  the desktop that involves moving windows around - becomes noticeably
  slower and "stutters", when the system is under high load. (Example:
  MP4 encoding with Handbrake.)

  The system should reserve sufficient resources not to noticeably
  disrupt the user experience. IMHO, this is a regression since it
  worked under 12.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.0+14.04.20140423-0ubuntu1.2
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3
  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: Wed May 14 20:57:00 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 4.3.10, 3.13.0-24-generic, x86_64: installed
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:7817]
  InstallationDate: Installed on 2014-05-12 (1 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64+mac (20140417)
  MachineType: MSI MS-7817
  ProcEnviron:
   LANGUAGE=de_DE
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/25/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V10.2
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: B85M-E45 (MS-7817)
  dmi.board.vendor: MSI
  dmi.board.version: 2.0
  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: 2.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV10.2:bd09/25/2013:svnMSI:pnMS-7817:pvr2.0:rvnMSI:rnB85M-E45(MS-7817):rvr2.0:cvnToBeFilledByO.E.M.:ct3:cvr2.0:
  dmi.product.name: MS-7817
  dmi.product.version: 2.0
  dmi.sys.vendor: MSI
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  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
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Wed May 14 18:40:00 2014
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Video Bus            KEYBOARD, id 7
   input        Power Button         KEYBOARD, id 8
   input        Microsoft  Microsoft Basic Optical Mouse v2.0  MOUSE, id 9
   input        AT Translated Set 2 keyboard KEYBOARD, id 10
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                2589 
   vendor                                     SAM
  xserver.version: 2:1.15.1-0ubuntu2

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