Display flickers when changing users

[Daniel Kohler]

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

[Daniel Kohler (globeiter)]

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

[penalvch (penalvch)]

Daniel Kohler, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1438054/comments/2 regarding this being fixed with an update. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.