(In reply to Michel Dänzer from comment #10)
> (In reply to taijian from comment #9)
> > OK, so I did some git-bisect work in order to find where exactly booting
> > with amdgpu.dc=0 broke. What I found is attached, although it does not make
> > much sense to me...
> 
> Indeed, it's pretty much impossible for that change to cause the problem.
> 
> Most likely, the issue with amdgpu.dc=0 happens with some probability <
> 100%, so you'd have to test longer / several times before declaring a commit
> as good. (A commit where the problem occurs can immediately be marked as bad)

That's what I figured... So, back to testing...