I was supporting another Xubuntu 19.10 user on AMD Ryzen 3 2200G (Gigabyte Technology Co., Ltd. B450 AORUS M/B450 AORUS M, BIOS F2 08/08/2018) today, whose log of a failed (standard) boot (to black screen) showed
kernel: WARNING: CPU: 2 PID: 255 at drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:932 dcn10_verify_allow_pstate_change_high.cold+0xc/0x23d [amdgpu]
I was supporting another Xubuntu 19.10 user on AMD Ryzen 3 2200G (Gigabyte Technology Co., Ltd. B450 AORUS M/B450 AORUS M, BIOS F2 08/08/2018) today, whose log of a failed (standard) boot (to black screen) showed
kernel: WARNING: CPU: 2 PID: 255 at drivers/ gpu/drm/ amd/amdgpu/ ../display/ dc/dcn10/ dcn10_hw_ sequencer. c:932 dcn10_verify_ allow_pstate_ change_ high.cold+ 0xc/0x23d [amdgpu]
which seems to be discussed at https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 109628