Comment # 1 on bug 108778 from erhard_f@mailbox.org

Created attachment 142506 [details]
dmesg (4.19.2, non-working)

Same here on kernel 4.19.2 with a R9 390. The other 2 cards in my system (R9
Nano) are working fine.

inxi -G
Graphics:  Card-1: Advanced Micro Devices [AMD/ATI] Fiji [Radeon R9 FURY / NANO
Series]
           Card-2: Advanced Micro Devices [AMD/ATI] Hawaii PRO [Radeon R9
290/390]
           Card-3: Advanced Micro Devices [AMD/ATI] Fiji [Radeon R9 FURY / NANO
Series]
           Display Server: X.Org 1.20.0
           drivers: ati,amdgpu (unloaded: modesetting,radeon)
           Resolution: 1280x800@60.00hz
           OpenGL: renderer: llvmpipe (LLVM 6.0, 128 bits)
           version: 3.3 Mesa 18.2.4

This is a regression, as the R9 390 works fine on kernel 4.18.19.