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[timothymowens <1431654@xxxxxxxxxxxxxxxxxx>]

FYI, in case there are some lesser experienced users that have this
issue and are looking for a temporary solution for the time being, below
are the instructions to revert to the previous release of lightdm until
this gets resolved.

You can do this with the following command in a terminal (<CTRL + ALT +
T>):

    sudo apt-get install lightdm=1.2.3-0ubuntu2.5

Then to kill the current lightdm session and start a new one using the
previous released version, log out, then press <CTRL + ALT + F1>.  Log
into the fullscreen terminal session.  Then type the following:

    sudo service lightdm stop

    sudo service lightdm start

Then to close the terminal session, press <CTRL + ALT + F1> once again,
type exit, then <CTRL + ALT + F7> to return to your lightdm session.
After that, you can log in and you're back to normal.

I also locked the lightdm package after reverting back for the time
being so that I don't accidentally reinstall the broken version by doing
the following in a terminal:

    sudo echo "lightdm hold" | dpkg --set-selections

Once this gets fixed or a new version is released later on, you can
release the lock/hold with the following command in a terminal:

    sudo echo "lightdm install" | dpkg --set-selections

Hope that helps!

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1431654

Title:
  lightdm (1.2.3-0ubuntu2.6) 100%/high cpu usage

Status in lightdm package in Ubuntu:
  Confirmed

Bug description:
  Since updating lightdm today, one core of my CPU is always maxed out
  at 100%.  I rolled back to version 1.2.3-0ubuntu2.5 and the issue
  stopped.  I tried this with 2 different kernels: 3.2.0-77-generic and
  3.2.0-79-generic and and version 1.2.3-0ubuntu2.6 of lightdm still
  caused 100% cpu usage.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: lightdm 1.2.3-0ubuntu2.6
  ProcVersionSignature: Ubuntu 3.2.0-77.114-generic 3.2.66
  Uname: Linux 3.2.0-77-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu17.8
  Architecture: amd64
  Date: Thu Mar 12 20:20:12 2015
  ExecutablePath: /usr/sbin/lightdm
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MarkForUpload: True
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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