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[Bug 1410406] Re: black screen after booting, 100% cpu usage

 

I can confirm this error in Xubuntu 15.04. The error is in deed fixed by installing updates. However the issue appears again with multiple monitors. 
If you click anywhere the login window will be displayed. This issue is fixed by inserting

active-monitor=0 on the end of file /etc/lightdm/lightdm-gtk-
greeter.conf

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https://bugs.launchpad.net/bugs/1410406

Title:
  black screen after booting, 100% cpu usage

Status in lightdm-gtk-greeter package in Ubuntu:
  Confirmed

Bug description:
  After booting, I get no login screen, but a black screen. inspecting
  the running processes in a vterm, I see lightdm-gtk-greeter consuming
  100% of one processor.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lightdm-gtk-greeter 1.9.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.18.0-8.9-generic 3.18.1
  Uname: Linux 3.18.0-8-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.15.1-0ubuntu2
  Architecture: amd64
  Date: Tue Jan 13 19:14:47 2015
  InstallationDate: Installed on 2014-12-30 (14 days ago)
  InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141229)
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: lightdm-gtk-greeter
  UpgradeStatus: No upgrade log present (probably fresh install)

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References