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[Xtien <1515711@xxxxxxxxxxxxxxxxxx>]

I have upgraded to Ubuntu 15.10, bug is still there.

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https://bugs.launchpad.net/bugs/1515711

Title:
  lightdm hangs, windows freeze, lightdm restart helps most of the
  times.

Status in lightdm package in Ubuntu:
  New

Bug description:
  Since a few days, when I use Android Studio, my screens freeze.
  Nothing works. With alt-crtrl-F2 I log in to a shell window, restart
  lightdm, then it works. Except on the last freeze, now I had to
  restart the computer. When restarting lightdm, a popup said "system in
  low graphics res, cannot detect your settings".

  I have reported the but to Android Studio developers. But a program,
  even a big one like an IDE, should not be able to crash my computer.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lightdm 1.14.2-0ubuntu1.1
  ProcVersionSignature: Ubuntu 3.19.0-33.38-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-33-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.7
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Nov 12 18:22:33 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-10-02 (41 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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