(In reply to Alex Deucher from comment #17)
> amd-staging-drm-next is still based on 4.15-rc4 which still has the
> regression mentioned in comment 14.  Can you try 4.15 final or my
> drm-next-4.17-wip branch?

Just did this - but no change of symptoms, still crash upon every S3 resume
attempt.