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[Launchpad Bug Tracker <1497621@xxxxxxxxxxxxxxxxxx>]

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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: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug vivid
-- 
Unity display corrupted on login or switch user
https://bugs.launchpad.net/bugs/1497621
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