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Public bug reported:

I have a new install of 15.04.  I am using lightdm with a unity desktop
(default).  I have two users on my system.  Often when I log in or
switch user unity or lightdm (I don't know enough to understand which
one) will freeze on a corrupted display.  The launcher icons and the
launcher will be overwritten with some pseudo-random pattern.  the bar
across the top of the display will also be corrupted.  Sometimes the
display has both my desktop and the unity-login greeter mixed.  I
usually can't type or do alt-f2 for several seconds.  At some point
(usually several seconds later) the display will appear to "reset,"
sometimes once, sometimes several times and eventually will settle on an
uncorrupted, usable screen.  If I switch user 10 times this will happen
on 8 of them.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: lightdm 1.14.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.3
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Sep 19 13:32:18 2015
InstallationDate: Installed on 2015-09-07 (11 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
LightdmConfig:
 [SeatDefaults]
 user-session=ubuntu
 greater-session=unity-greeter
 allow-guest=false
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1497621

Title:
  Unity display corrupted on login or switch user

Status in lightdm package in Ubuntu:
  New

Bug description:
  I have a new install of 15.04.  I am using lightdm with a unity
  desktop (default).  I have two users on my system.  Often when I log
  in or switch user unity or lightdm (I don't know enough to understand
  which one) will freeze on a corrupted display.  The launcher icons and
  the launcher will be overwritten with some pseudo-random pattern.  the
  bar across the top of the display will also be corrupted.  Sometimes
  the display has both my desktop and the unity-login greeter mixed.  I
  usually can't type or do alt-f2 for several seconds.  At some point
  (usually several seconds later) the display will appear to "reset,"
  sometimes once, sometimes several times and eventually will settle on
  an uncorrupted, usable screen.  If I switch user 10 times this will
  happen on 8 of them.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lightdm 1.14.2-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
  Uname: Linux 3.19.0-28-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Sep 19 13:32:18 2015
  InstallationDate: Installed on 2015-09-07 (11 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  LightdmConfig:
   [SeatDefaults]
   user-session=ubuntu
   greater-session=unity-greeter
   allow-guest=false
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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