Public bug reported:

Hello,

I cannot switch user graphical session anymore. Ubuntu 13.10 here, lightdm 
1.8.5-0ubuntu1.
The screen goes black with text cursor blinking in the top left corner and a 
mouse arrow. After some time I get back to my session.

Tried removing ~/.Xauthority with no luck.

There is a /home/SteamLibrary folder without a corresponding user, doubt
that could a problem though.

No custom kernels, neither drivers. Integrated Intel video.

lsb_release -rd
Description:    Ubuntu 13.10
Release:        13.10

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xorg 1:7.7+1ubuntu6
ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
Uname: Linux 3.11.0-15-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.12.5-0ubuntu2.2
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
Date: Mon Dec 30 16:36:43 2013
DistUpgraded: 2013-10-27 00:45:46,849 DEBUG enabling apt cron job
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.2.16, 3.11.0-14-generic, x86_64: installed
 virtualbox, 4.2.16, 3.11.0-15-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:8534]
InstallationDate: Installed on 2013-10-10 (80 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: ASUS All Series
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic 
root=UUID=59777031-18fb-48a0-8496-f8631f11e961 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to saucy on 2013-10-26 (64 days ago)
dmi.bios.date: 07/16/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0502
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H87-PLUS
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.:bvr0502:bd07/16/2013:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH87-PLUS:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: All Series
dmi.product.version: System Version
dmi.sys.vendor: ASUS
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.14.5-1ubuntu2~saucy1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Mon Dec 30 14:29:31 2013
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               41082 
 vendor                                     DEL
xserver.version: 2:1.14.5-1ubuntu2~saucy1

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


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

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https://bugs.launchpad.net/bugs/1265016

Title:
  Cannot switch user session

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