Kevin Dalley, thank you for reporting this and helping make Ubuntu
better.

1) Regarding non-default kernel boot parameter i915.i915_enable_rc6=1 is
this required? If you remove it, how does it affect this issue?

2) After you login, are there crash files in the /var/crash folder?

3) To confirm, if you install gnome-session-flashback and login to it
does this provide a WORKAROUND?

4) Do you have any self-compiled/unsupported software installed?

** Changed in: xorg (Ubuntu)
   Importance: Undecided => Medium

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1770306

Title:
  X display is black after 18.04 upgrade from 17.10

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