OK reading the original bug reports more closely, this *does* appear to
be a different bug entirely.  Because we never see a cursor on the
screen, the laptop panel literally fails link training.

** This bug is no longer a duplicate of bug 1821820
   Cannot boot or install - have to use nomodeset

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https://bugs.launchpad.net/bugs/1824216

Title:
  Linux 5.0 regression i915 module, black screen on boot for certain
  laptop panels

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On my Dell XPS 9575, I get a black screen on boot when running the
  19.04 live image, OR after updating from 18.10 to 19.04.  It appears
  to be a kernel related bug that was introduced in 5.0 that is affected
  by certain laptop panels not conforming to their stated
  specifications.

  Several other Dell systems exhibit the same issue, and it's very
  possible that there are other panels used on other systems that will
  also have the same issues.

  Intel is aware of this issue and has already created a patch.  You can
  see the relevant threads here:

  https://bugs.freedesktop.org/show_bug.cgi?id=109959

  And the patch here:

  https://patchwork.freedesktop.org/patch/296411/

  It would be fantastic to get this patch applied before release, as it
  would be very difficult install 19.04 on the affected systems
  otherwise.  I was able to get the live image booted by adding the
  nomodeset kernel parameter to grub, so as a work around you can use
  this approach to install.

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