OK -- havent tried the recent one but here is my update
...And I wont until you get rid of drm2 ....
the now defunct freebsd aka linux-3.18 method of getting to X
OpenBSD works ,,,, monolithic kernel X windows Xfce4 / kde4
DragonFlyBSD works, sort of, xfce4 still jittery on fonts ... but efi converged with freebsd
FreeBSD does not work ... as above
When i say work i mean X windows Xorg ... etc
So eric please post details of kernel source and details / for me the kaveri kms amd bootcode fb swap to gfx...?