Public bug reported:

lightdm tries to initialize screen output, fails, tries again, fails
until the backlight electronics break, killing the monitor.

lightdm fails initializing screen. This turns on backlight, initializes
graphics, then lightdm stops with an error message. systemd starts
lightdm again. Lightdm tries to initialize graphics. This turns on
backlight. Lightdm fails, exausts an error message, backlight turns off
again. systemd starts lightdm, lightdm tries to initialize graphics.
Turns on backlight. Exausts an error message. Backlight is turned off
again. ...

After doing so more than twice a second backlight breaks. Electronics
broke down.

Conclusion: at the moment Ubuntu 18.10 is capable of killing monitors by
lightdm not able to initialize screens and breaking, then beeing
restarted by systemd.

Since this can kill hardware it is a no go! It is a bad bad bad bad bad
bad bad bad bad bad bad bad bad bad bug!

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: lightdm 1.28.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
Date: Sat Nov  3 17:03:19 2018
InstallationDate: Installed on 2011-10-19 (2571 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: lightdm
UpgradeStatus: Upgraded to cosmic on 2018-11-03 (0 days ago)

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


** Tags: amd64 apport-bug cosmic

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Touch seeded packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1801533

Title:
  lightdm does not start

Status in lightdm package in Ubuntu:
  New

Bug description:
  lightdm tries to initialize screen output, fails, tries again, fails
  until the backlight electronics break, killing the monitor.

  lightdm fails initializing screen. This turns on backlight,
  initializes graphics, then lightdm stops with an error message.
  systemd starts lightdm again. Lightdm tries to initialize graphics.
  This turns on backlight. Lightdm fails, exausts an error message,
  backlight turns off again. systemd starts lightdm, lightdm tries to
  initialize graphics. Turns on backlight. Exausts an error message.
  Backlight is turned off again. ...

  After doing so more than twice a second backlight breaks. Electronics
  broke down.

  Conclusion: at the moment Ubuntu 18.10 is capable of killing monitors
  by lightdm not able to initialize screens and breaking, then beeing
  restarted by systemd.

  Since this can kill hardware it is a no go! It is a bad bad bad bad
  bad bad bad bad bad bad bad bad bad bad bug!

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: lightdm 1.28.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  Uname: Linux 4.18.0-11-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  Date: Sat Nov  3 17:03:19 2018
  InstallationDate: Installed on 2011-10-19 (2571 days ago)
  InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to cosmic on 2018-11-03 (0 days ago)

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