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[Bug 1431654] Re: lightdm (1.2.3-0ubuntu2.6) 100%/high cpu usage

 

Here is the lightdm log file pulled from /var/log/lightdm/lightdm.log.
At 98.76s, I logged out of my session, but didn't get a log-in screen
again (black screen on both monitors).

At this point I killed the process (28882) so that I could downgrade
lightdm again (from ctrl+alt+F1) and log back in.

Not sure if it's applicable, but the log that was generated was with
kernel version 3.2.0-19-generic running.  Also, the proprietary graphics
driver I'm running at the moment is Nvidia v340.76.  I also tested with
v340.65 but still ran into the 100% cpu usage with the newest proposed
lightdm service.

** Attachment added: "lightdm log file"
   https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1431654/+attachment/4343680/+files/lightdm.log

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https://bugs.launchpad.net/bugs/1431654

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

Status in lightdm package in Ubuntu:
  New

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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References