https://bugs.freedesktop.org/show_bug.cgi?id=98276
--- Comment #5 from Johannes Hirte johannes.hirte@datenkhaos.de --- (In reply to Mike Lothian from comment #4)
rmmod -f amdgpu should do the trick
This way I can remove the module, but I don't get the panic. The screen goes black and I have to reboot via SysReq Keys.