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[Bug 1568211] Re: Unable to boot
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
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
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Unable to boot
Status in linux package in Ubuntu:
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
[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
WORKAROUND: Adding the nomodeset parameter the main kernel command
line finally booted the system.
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