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[Peter Würtz <pwuertz@xxxxxxxxxxxxxx>]

The freeze also happens whenever I interact with a ComboBox in QtQuick Applications. ComboBox seems to open and close a small window on top of the Application for displaying/selecting the items.
General observation: Whenever a QtQuick related Window is opened and closed in Unity, Firefox and QtCreator will freeze.

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https://bugs.launchpad.net/bugs/1472622

Title:
  Unity doesn't update or freezes contents within application window

Status in Unity:
  Incomplete
Status in unity package in Ubuntu:
  Incomplete

Bug description:
  When switching between different application windows there is a chance that the contents of a window just freeze. For me this happens with Firefox quite often, and extremely often when using QtCreator. Once such a window is frozen, scrolling or keyboard input seems to work, but you won't see any effect because the window contents are not updated anymore.
  You can "re-animate" such a frozen window again by just resizing it a bit, but it will get stuck again some time later after switching between windows.

  This bug doesn't happen with openbox or gnome as window manager /
  compositor.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: unity 7.3.2+15.04.20150420-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
  Uname: Linux 3.19.0-22-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.76  Thu Jan 22 12:11:08 PST 2015
   GCC version:  gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Wed Jul  8 15:23:19 2015
  DistUpgraded: Fresh install
  DistroCodename: vivid
  DistroVariant: ubuntu
  GraphicsCard:
   NVIDIA Corporation GT218 [GeForce 210] [10de:0a65] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:8343]
  InstallationDate: Installed on 2014-03-19 (475 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140319)
  MachineType: Tarox Prof. Workstation P7Q
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-22-generic root=UUID=403365c1-32ea-4fc9-b389-6a61e48dec7c ro quiet splash
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/02/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0080
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P7Q57-M DO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev x.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0080:bd08/02/2011:svnTarox:pnProf.WorkstationP7Q:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP7Q57-MDO:rvrRevx.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: Prof. Workstation P7Q
  dmi.product.version: System Version
  dmi.sys.vendor: Tarox
  version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.60-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Wed Jul  8 12:50:05 2015
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        Logitech USB-PS/2 Optical Mouse MOUSE, id 8
   input        LITEON Technology USB Multimedia Keyboard KEYBOARD, id 9
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.17.1-0ubuntu3

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