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[Joe Helfrifch <joe@xxxxxxxxxxx>]

I'm having the same issue.  The black screen problem showed up somewhere
in the last week of January, as I documented having to use the nomodeset
boot parameter in the course of investigating another bug
(https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1537308).

The nomodeset was a valid workaround for a while, but something in 16.04
has broken it.  Adding it to the grub parameters allows me to boot, but
the resolution is stuck at 800 X 600.  It appears that adding nomodeset
causes both the amdgpu code and the radeon code to give up and go home.

As near as I can tell from other reports I've found, this is occurring
across distros.

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https://bugs.launchpad.net/bugs/1568211

Title:
  Unable to boot

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I upgraded overnight from Wily to Xenial. The system will not boot.
  Only a blank screen after grub loads the kernel.

  The recovery kernel loads fine and I was able to find the following
  messages:

  [drm] VGACON disable radeon kernel modesetting
  [drm:radeon_init [radeon]] *ERROR* no UMS support in radeon module!

  The recovery kernel command line had a nomodeset parameter that was
  not in the main kernel command line.

  Note: For what it's worth I reported a similar issue against several
  Utopic kernels (bug #1407505). There was a back and forth with
  jsalisbury until a kernel finally worked. I have had no problems until
  today.

  WORKAROUND: Adding the nomodeset parameter the main kernel command
  line finally booted the system.

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