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[Daniel Kohler <globeiter@xxxxxx>]

The bug seems to have been fixed with the latest unity update
(7.2.4+14.04.20150316-0ubuntu1).

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https://bugs.launchpad.net/bugs/1438054

Title:
  Display flickers when changing users

Status in xorg package in Ubuntu:
  New

Bug description:
  Ubuntu 14.04

  xorg version: 1:7.7+1ubuntu8.1

  This bug occurs when trying to switch between two users on the system
  where both profiles are loaded.

  Expected behaviour:

  The system should switch from the lock screen of user1 to the logon
  screen of user2. Then, after supplying credentials, it should log on
  user2.

  What happened instead:

  When user2 supplies credentials and tries to log on, the screen
  flickers for about 5 seconds before showing the deskrop of user2. In
  some cases (as happened right before this bug report) the system will
  not succeed in logging on user2 and switch back to the logon screen.
  Sometimes when the system switches back to the logon screen, the
  screen will be unresponsive.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8.1
  ProcVersionSignature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16
  Uname: Linux 3.13.0-48-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: Mon Mar 30 09:13:20 2015
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 4.3.10, 3.13.0-46-generic, x86_64: installed
   virtualbox, 4.3.10, 3.13.0-48-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: CLEVO/KAPOK Computer Device [1558:5455]
  InstallationDate: Installed on 2014-06-12 (290 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Notebook W54_55SU1,SUW
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-48-generic root=UUID=be85682b-e370-40b8-afe4-1f292b33d6a8 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.5
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: W54_55SU1,SUW
  dmi.board.vendor: Notebook
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.5:bd04/01/2014:svnNotebook:pnW54_55SU1,SUW:pvrNotApplicable:rvnNotebook:rnW54_55SU1,SUW:rvrNotApplicable:cvnNotebook:ct9:cvrN/A:
  dmi.product.name: W54_55SU1,SUW
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Notebook
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1~ubuntu2
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.4
  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: Tue Mar 24 08:34:51 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                 803 
   vendor                                     LGD
  xserver.version: 2:1.15.1-0ubuntu2.7

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