Comment # 4 on bug 106199 from Öyvind Saether

I have the exact same problem on Fedora 28 with kernels 4.16.4 and 4.17rc2 and
amdgpu.dc=1 on who different systems, one with a RX 560 and one with a RX 580.
Both use DP.
>start computer, get lightdm, login to XFCE
>logout
>computer frozen
My solution as of now is to use amdgpu.dc=0 which doesn't have this problem.