Do you happen to know if cpu and case fan controls work on Debian on your machine? I have a server with a very similar setup, but cannot control the fans.
~ sensors
No sensors found! ~ sensors
No sensors found! $ sensors
amdgpu-pci-3800
Adapter: PCI adapter
vddgfx: N/A
vddnb: N/A
temp1: +36.0°C (crit = +80.0°C, hyst = +0.0°C)
k10temp-pci-00c3
Adapter: PCI adapter
Tdie: +36.5°C (high = +70.0°C)
Tctl: +36.5°C
I've not tested with my 2200g yet.
Unfortunately, the driver was abandoned last year, but copies of the code are still around on github.