Comment # 7 on bug 109539 from jon

>Do you still see the issue occur when amdgpu.dc=1 if you disable DP1.2 
>support in your monitor's OSD?

I will let you know.  After 7+ days of uptime without a single crash with
amdgpu.dc=0 I updated from kernel 4.20.5 to 4.20.7, set amdgpu.dc=1 and
disabled displayport 1.2 on the monitor using displayport.  I will report back.