Comment # 12 on bug 110865 from Dieter Nützel

(In reply to Alex Deucher from comment #9)
> Created attachment 144983 [details] [review] [review]
> fix DC code
> 
> Can you try applying both of these patches?  Assuming both of your monitors
> have the same timing this might work.

Didn't apply on amd-staging-drm-next, too.