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[Rob Tongue <robtongue@xxxxxxxxx>]

It is not restricted to nvidia devices.

** Package changed: xserver-xorg-video-nouveau (Ubuntu) => xorg-server
(Ubuntu)

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https://bugs.launchpad.net/bugs/1247189

Title:
  [13.10] Ubuntu freezes completely when switching user

Status in “lightdm” package in Ubuntu:
  New
Status in “linux” package in Ubuntu:
  Incomplete
Status in “xorg-server” package in Ubuntu:
  Confirmed

Bug description:
  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.

  WORKAROUND: Disable the nvidia card in the BIOS.

  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)

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