Comment # 12 on bug 109246 from Michel Dänzer

(In reply to tme from comment #9)
> Setting amdgpu.dc=1 on 4.15.18 and 4.16.18 does not reproduce the problem.
> It does, however, reproduce on 4.17.19.

Can you bisect between 4.16.18 and 4.17.19?

(I see some HPD filtering related changes between them, Nicholas / Harry maybe
you can take a look if anything jumps out?)