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[Bug 1522472] [NEW] Black screen on boot after updating Trusty


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

After updating my linux kernel from v3. to v3., 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. 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: linux (Ubuntu)
     Importance: Low
         Status: Incomplete

Black screen on boot after updating Trusty
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