I think I am experiencing the same issue. Upgrade to Ubuntu 18.04 failed.
Startup does not complete and screen sequences through: blank, startup console
output and corrupt/uninitialised screen with lots of colours.
Log in almost impossible on other console as screen switches back.
Managed to log
I've also reported it to kernel.org
** Tags added: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1766075
Title:
AMDGPU Failed to blank
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Yes this happened after an update and affects all linux kernels.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Title:
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.16
** Package changed: plymouth (Ubuntu) => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/1766075
Title:
AMDGPU Failed to blank
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** Summary changed:
- drm:hwss_wait_for_blank_comp
+ AMDGPU Failed to blank
** Tags added: amd64
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https://bugs.launchpad.net/bugs/1766075
Title:
AMDGPU Failed to blank
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