Comment # 2 on bug 107153 from Patrik Kullman

Right before this in journalctl:

[  268.322916] hades-media /usr/lib/gdm3/gdm-x-session[896]: (--) AMDGPU(0):
HDMI max TMDS frequency 300000KHz
[  268.324908] hades-media /usr/lib/gdm3/gdm-x-session[896]: (II) AMDGPU(0):
Allocate new frame buffer 4096x2160
[  268.324976] hades-media /usr/lib/gdm3/gdm-x-session[896]: (II) AMDGPU(0): 
=> pitch 16384 bytes