Public bug reported:

When I boot my laptop and get to the lightdm login prompt, the screen
blacks out for a fraction of second. This happens each time, only once,
and does not prevent logging in.

In fact it is not only a display glitch : if I start to type my password
before the blackout, the typed characters are lost when normal display
resumes.

So lightdm might be restarting.

This is only mildly annoying, but I am also experiencing other graphical
problems which may be or not be related.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.38-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun May  1 14:55:29 2016
InstallationDate: Installed on 2016-04-22 (8 days ago)
InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1577162

Title:
  Screens briefly blacks out at lightdm prompt

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