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[Kayleigh <kseagraves@xxxxxxxxxxxx>]

Public bug reported:

Current release: Ubuntu 14.04.3 LTS
Current version: v3.13.0.68.74
Expected behavior: System boots to GUI showing chromium-browser
What happened: Booted to black screen

After updating my linux kernel from v3.13.0.32.38 to v3.13.0.68.74, my
system does not boot into the GUI properly anymore. X11 starts up and I
have confirmed that I can interact with the screen that should be there
via keyboard (using chromium logs, I can confirm that I can open new
tabs with CTRL+T), but the screen is completely black. If I restart
nodm, X11 restarts and comes up as it should. If I simply switch to the
vivid kernel (v3.19.0.33.20) on the same system the problem goes away
and the system boots properly every time, as well as the system working
fine until I update just the linux-generic package.

Other possibly useful information:
- Every time the system boots to a black screen, plymouth does not appear while booting nor can I TTY switch to it after booting (instead the TTY it should be on is a black screen with a blinking cursor), which is opposite of the behavior observed when the system boots properly.
- Attached Xorg.0.log (produced from a bad boot).

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "X.org.log"
   https://bugs.launchpad.net/bugs/1522472/+attachment/4529100/+files/X.org.log

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https://bugs.launchpad.net/bugs/1522472

Title:
  Black screen on boot after updating Trusty

Status in xorg-server package in Ubuntu:
  New

Bug description:
  Current release: Ubuntu 14.04.3 LTS
  Current version: v3.13.0.68.74
  Expected behavior: System boots to GUI showing chromium-browser
  What happened: Booted to black screen

  After updating my linux kernel from v3.13.0.32.38 to v3.13.0.68.74, my
  system does not boot into the GUI properly anymore. X11 starts up and
  I have confirmed that I can interact with the screen that should be
  there via keyboard (using chromium logs, I can confirm that I can open
  new tabs with CTRL+T), but the screen is completely black. If I
  restart nodm, X11 restarts and comes up as it should. If I simply
  switch to the vivid kernel (v3.19.0.33.20) on the same system the
  problem goes away and the system boots properly every time, as well as
  the system working fine until I update just the linux-generic package.

  Other possibly useful information:
  - Every time the system boots to a black screen, plymouth does not appear while booting nor can I TTY switch to it after booting (instead the TTY it should be on is a black screen with a blinking cursor), which is opposite of the behavior observed when the system boots properly.
  - Attached Xorg.0.log (produced from a bad boot).

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