Comment # 3 on bug 104412 from S.H.

Sorry, pressed the send button too early.

For anyone willing to help, here's my system:
- kernel-4.15-rc5
- xf86-video-amdgpu-1.4.0
- xorg-server-1.19.6
- Sapphire RX 460
- iiyama G-Master GB2888UHSU 

If you need any further information/testing/answers please don't hesitate to
contact me.

Thank you