I've compiled a mainline build from here: https://kernel.ubuntu.com
/~kernel-ppa/mainline/v5.0.7/.

I applied all the Ubuntu patches as well as the patch from here:
https://patchwork.freedesktop.org/patch/296411/

Raw patch download here:
https://patchwork.freedesktop.org/patch/296411/raw/

And things are working correctly again.  It looks like Intel devs have
cherry picked this fix into intel-drm-fixes, so hopefully this gets into
mainline 5.0.8 and eventually trickles down to the Ubuntu kernels.

If possible it would be great to manually apply this patch to the
release kernel for 19.04 so people won't have problems installing.

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

Title:
  Linux 5.0 black screen on boot, display flickers (i915 regression with
  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.

To manage notifications about this bug go to:
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