apport information

** Attachment added: "LightdmLog.txt"
   
https://bugs.launchpad.net/bugs/1577162/+attachment/4700779/+files/LightdmLog.txt

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

Title:
  Screens briefly blacks out at lightdm prompt

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  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 (namely #1568604).

  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)
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: XFCE
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
     Subsystem: Dell Broadwell-U Integrated Graphics [1028:062e]
     Subsystem: Dell GM108M [GeForce 840M] [1028:062e]
  InstallationDate: Installed on 2016-04-22 (82 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  LightdmDisplayLog:
   (II) AIGLX: Suspending AIGLX clients for VT switch
   (II) AIGLX: Suspending AIGLX clients for VT switch
  MachineType: Dell Inc. Latitude E7450
  NonfreeKernelModules: wl
  Package: xorg 1:7.7+13ubuntu3
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-30-generic 
root=UUID=479420cb-def5-46a9-907c-007c03dc04ba ro
  ProcVersionSignature: Ubuntu 4.4.0-30.49-generic 4.4.13
  Tags: third-party-packages xenial possible-manual-nvidia-install ubuntu
  Uname: Linux 4.4.0-30-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm bumblebee cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/17/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A13
  dmi.board.name: 0NC6G7
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA13:bd05/17/2016:svnDellInc.:pnLatitudeE7450:pvr:rvnDellInc.:rn0NC6G7:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7450
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2

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