https://bugs.freedesktop.org/show_bug.cgi?id=82201
--- Comment #37 from Kai kai@dev.carbon-project.org --- (In reply to Christian König from comment #36)
Ah! Ok that's something different. As long as the system was completely off (defined by no power to the GPU) there shouldn't be any influence from the previously booted os.
Well, I would say the GPU didn't have power. I mean some parts of the motherboard stay powered for e.g. wake on LAN, but otherwise? I can try whether disconnecting the power makes a difference, if you feel, that would be helpful in tracking this down.