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[Bug 1247189] [NEW] [13.10] Ubuntu freezes completely when switching user


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I'm using a freshly installed Ubuntu 13.10.
As soon as I click on a different user I want to switch to in the gearbox menu I get a black screen and nothing else is happening. I'm still able to SSH to that box and top does not show any process taking 100% CPU. Alt+sysrq+b is able to reboot the system.
I had no problem like this with Ubuntu 13.04 on the same computer.

Update: There is no issue if the nVidia card is disabled in the BIOS and
I'm using the integrated video card of my i7 CPU.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: lightdm 1.8.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Fri Nov  1 17:40:41 2013
InstallationDate: Installed on 2013-10-30 (2 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete

** Tags: amd64 apport-bug saucy
[13.10] Ubuntu freezes completely when switching user
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