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[Alex <identityinvisible@xxxxxxxxxx>]

I'm also having this issue in Ubuntu 15.10, and can provide logs if
needed.

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https://bugs.launchpad.net/bugs/1314587

Title:
  Windows slow/stall/freeze when minimizing/restoring/etc in Unity 7
  (14.04 and 14.10)

Status in Unity:
  Confirmed
Status in X.Org X server:
  Won't Fix
Status in unity package in Ubuntu:
  Triaged
Status in xorg package in Ubuntu:
  Triaged

Bug description:
  Steps to reproduce:

   * Minimize current window or alt-tab between windows
   * Reveal launcher to click on application
   * Click `Super` to bring up Dash
   * Hold `Super` to bring up Keyboard Shortcuts

  What should happen:

  Action completes smoothly and quickly.

  What happens instead:

   * Action may be slow / animation jerky.
   * Action may stall (animation frozen on given frame, e.g. window partially minimized) - initiating another action cancels first action and second action may succeed (most often calling Guake with F12 seems to solve the issue)
   * Action may freeze - cursor no longer moves - a soft reboot (Alt+PrtScr+REISUB) usually works, otherwise a hard reboot

  Notes:

   * Not application specific. Minimizing is reliably slow/stalls with minimizing Firefox (including 29, I do not have a lot of bookmarks) or Pidgin, but I use those programs more often.
   * I am using an Nvidia Optimus machine with the default Nouveau driver - no `nvidia-prime`, no Bumblebee. I temporarily installed the latest stable Nvidia driver (including `nvidia-prime`) and it made no difference.
   * I did not experience this issue on the same machine running 13.10 (with Bumblebee).
   * I am running Maximus.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-24.46-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 Apr 30 12:53:15 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 4.3.10, 3.13.0-24-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Several times a day
  GpuHangReproducibility: Occurs more often under certain circumstances
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:04b6]
   NVIDIA Corporation GF108M [GeForce GT 525M] [10de:0df5] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:04b6]
  InstallationDate: Installed on 2014-04-24 (5 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Dell System XPS L502X
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=3a8fb3f3-1054-45a0-8ec0-0cbeba33da00 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/25/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 0YR8NN
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd03/25/2011:svnDellInc.:pnDellSystemXPSL502X:pvr:rvnDellInc.:rn0YR8NN:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L502X
  dmi.sys.vendor: Dell Inc.
  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
  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 Apr 30 12:03:43 2014
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                8940 
   vendor                                     AUO
  xserver.version: 2:1.15.1-0ubuntu2

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