https://bugzilla.kernel.org/show_bug.cgi?id=204725
--- Comment #40 from Dmitri Seletski (drjoms@gmail.com) --- ok... some good news.
3d acceleration works after mesa recompilation. I still have black screen in mesa, but it's lesser of my problems at the moment. I will try reboot and see if it goes away, though I doubt it. I shall see if Mike's config works and report back.