https://bugs.freedesktop.org/show_bug.cgi?id=105423
--- Comment #3 from Andrey Grodzovsky andrey.grodzovsky@amd.com --- (In reply to Max from comment #2)
Thanks to Nick Sarnie on Discord, he found that disable completely DC fix the issue.
I fix it with "amdgpu.dc=0" in my grub.conf
Did you try latest kernel (4.16.rc4 i think) seems to me this issue is already fixed there in DC.
Andrey