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[Robert Stiffler <rstiffler92@xxxxxxxxx>]

*** This bug is a duplicate of bug 1410406 ***
    https://bugs.launchpad.net/bugs/1410406

I have a multiple monitor setup also. Adding "active-monitor=0" to
/etc/lightdm/lightdm-gtk-greeter.conf fixed the issue.

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https://bugs.launchpad.net/bugs/1448214

Title:
  lightdm-gtk-greeter uses 100% CPU and shows gray screen

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

Bug description:
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=15.04
  DISTRIB_CODENAME=vivid
  DISTRIB_DESCRIPTION="Ubuntu 15.04"

  Package: lightdm-gtk-greeter 2.0.0-0ubuntu1

  ubuntu-bug output is attached with deatiled system info.

  After upgrading Xubuntu from 14.10 to 15.04 the log in screen remains
  gray and the lightdm-gtk-greeter process consumes 100% CPU on one
  core.

  I expected a login screen. When stopping/starting the service with
  systemctl [re]start|stop lightdm.service

  I recieved "Error: No space left on device." as an error. This was
  misleading as I don't have a space issue.

  I added "allow-debugging=true" to "/etc/lightdm/lightdm-gtk-
  greeter.conf" then I restarted lightdm.

  In the log I could then see that the greeter was switching between
  active monitors endlessly.

  ...
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: Read 8 bytes from daemon
  DEBUG-Message: Read 37 bytes from daemon
  DEBUG-Message: Prompt user with 1 message(s)
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  DEBUG-Message: [Background] Active monitor changed to: DP1 #0
  DEBUG-Message: [Background] Active monitor changed to: HDMI1 #1
  ...

  So I set
  "active-monitor=0" and restarted lightdm. This solved the issue.

  I suspect this may only happen with multi monitor setups and on
  mirrors displays that have a cursor on both. This is unclear to me
  though.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lightdm-gtk-greeter 2.0.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Apr 24 12:09:07 2015
  InstallationDate: Installed on 2014-08-06 (261 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  SourcePackage: lightdm-gtk-greeter
  UpgradeStatus: Upgraded to vivid on 2015-04-24 (0 days ago)

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