attachment is generated by the nvidia-bug-reporting tool, which collects
many logs

** Attachment added: "nvidia-gathered logs"

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Touch seeded packages, which is subscribed to lightdm in Ubuntu.

  blank screen (no backlight) after login on both xubuntu and ubuntu
  desktops, Optimus laptop

Status in lightdm package in Ubuntu:

Bug description:
  I have a Thinkpad W520. In Optimus mode, lightdm presents a blank screen 
after login. Virtual terminals work. 
  On the same laptop, gdm3 allows me to log in to ubuntu desktop. 
  In pure Nvidia mode, login works. 

  The bug report tool told me that log files will be attached.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: lightdm 1.26.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
  Uname: Linux 4.15.0-15-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  Date: Sun Apr 15 19:55:08 2018
  InstallationDate: Installed on 2018-02-25 (49 days ago)
  InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180225)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)

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