Public bug reported:

After entering a password to unlock the computer the desktop is shown and is 
usable for about 1 second, then the screen goes black for 5 seconds or so, then 
return to normal.
Using NVIDIA drivers 331.38 from the package nvidia-331.


$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu Trusty Tahr (development branch)
Release:        14.04
Codename:       trusty
$ apt-cache policy lightdm
lightdm:
  Installed: 1.9.14-0ubuntu2
  Candidate: 1.9.14-0ubuntu2
  Version table:
 *** 1.9.14-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.9.14-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Apr  7 14:45:47 2014
InstallationDate: Installed on 2014-01-04 (93 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
SourcePackage: lightdm
UpgradeStatus: Upgraded to trusty on 2014-03-09 (29 days ago)

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


** Tags: amd64 apport-bug third-party-packages trusty

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https://bugs.launchpad.net/bugs/1303999

Title:
  After unlocking, desktop is shown then screen goes black for about
  five seconds

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  After entering a password to unlock the computer the desktop is shown and is 
usable for about 1 second, then the screen goes black for 5 seconds or so, then 
return to normal.
  Using NVIDIA drivers 331.38 from the package nvidia-331.

  
  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu Trusty Tahr (development branch)
  Release:      14.04
  Codename:     trusty
  $ apt-cache policy lightdm
  lightdm:
    Installed: 1.9.14-0ubuntu2
    Candidate: 1.9.14-0ubuntu2
    Version table:
   *** 1.9.14-0ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: lightdm 1.9.14-0ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
  Uname: Linux 3.13.0-23-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Apr  7 14:45:47 2014
  InstallationDate: Installed on 2014-01-04 (93 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 
(20131016.1)
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to trusty on 2014-03-09 (29 days ago)

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