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[Daniel <daniel@xxxxxxxxx>]

I am experiencing this issue since I upgraded to 13.10 from 13.04.
No nVidia card but Intel:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09)

The system does not hang. From my experience it just get stuck trying to open a new VT.
It fails to switch to the Greeter and a black screen is shown, but you can go back to your previous VT (CTRL-ALT-F7) or to a new one (e.g. tty1).

Versions:
lightdm 1.8.4-0ubuntu1  amd64
kernel 3.11.0-14-generic
All packages up-to-date as of 20131228.1000-UTC


WORKAROUND:
The problem solved after updating lightdm to version 1.8.5-0ubuntu1, available in saucy-proposed repository.

After the lightdm upgrade I experience some performance issues related
to plugin xfce4-xkb-plugin when switching between users. Seem to be
resolved removing the plugin from all panels.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1247189

Title:
  [13.10] Ubuntu freezes completely when switching user

Status in “lightdm” package in Ubuntu:
  Confirmed
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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