Comment # 12 on bug 103953 from Alex Deucher

(In reply to Aleksei from comment #11)
> I'm losing refresh rates higher than 60Hz with dc=1 on 4.15.6 kernel - is
> that fixed too?
> 
> Monitor 1920x1080 144Hz, GPU RX 560, connection over DVI-D. With dc=0 I can
> set 1920x1080 144Hz, with dc=1 only 1920x1080 60Hz.

You'll need the latest 4.16 with the fixes I sent out yesterday.