Comment # 1 on bug 100745 from Edward O'Callaghan

OK, I had a short look into this,

So it seems that we have that,

 amdgpu_atombios_dp_aux_transfer() calls amdgpu_atombios_dp_process_aux_chan()

which has either a ucReplyStatus == 2 or 3 from atombios returned.

If you could please attach dmesg logs after running

 # echo 0xf > /sys/module/drm/parameters/debug

and waiting for the situation to reoccur that would be most useful.