Public bug reported:

This happens rarely but it makes Unity hang. You need to restart it via
another VT which results in pretty poor performance.

1. Hit Meta-Key select an application and launch

Actual Result: Unity opens the application window and freezes

Proposed Result: The application just opens.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: unity 7.3.1+14.10.20141016-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
Uname: Linux 3.16.0-24-generic x86_64
.tmp.unity.support.test.0:
 
.tmp.unity.support.test.1:
 
ApportVersion: 2.14.7-0ubuntu8
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: Tue Nov 25 15:46:33 2014
DistUpgraded: 2014-10-24 09:10:03,805 DEBUG enabling apt cron job
DistroCodename: utopic
DistroVariant: ubuntu
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7550M/7570M/7650M] 
[1002:6841] (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:17a9]
InstallationDate: Installed on 2013-11-01 (389 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Hewlett-Packard HP ProBook 6570b
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-24-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to utopic on 2014-10-24 (32 days ago)
dmi.bios.date: 07/16/2013
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68ICF Ver. F.43
dmi.board.name: 17A7
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 42.36
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68ICFVer.F.43:bd07/16/2013:svnHewlett-Packard:pnHPProBook6570b:pvrA1029D1103:rvnHewlett-Packard:rn17A7:rvrKBCVersion42.36:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP ProBook 6570b
dmi.product.version: A1029D1103
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.914-1~exp1ubuntu4.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Tue Nov 25 09:44:48 2014
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.16.0-1ubuntu1
xserver.video_driver: radeon

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 ubuntu utopic

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https://bugs.launchpad.net/bugs/1396184

Title:
  Launching an Application via Unity results in Unity hang

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