https://bugs.freedesktop.org/show_bug.cgi?id=103686
--- Comment #1 from Shiverly shiverly@mt2015.com --- This may be just a default kernel problem. I installed these packages (firmware and UBUNTU 4.13.11+ .deb's) https://github.com/M-Bab/linux-kernel-amdgpu-binaries and monitor is detected as DVI-D-1, as it should be.