https://bugzilla.kernel.org/show_bug.cgi?id=108221
--- Comment #9 from Fred Santos frederic.santos@u-bordeaux.fr --- Thanks for your answer.
Yes, the log is quite strange about that, since xf86-video-amdgpu is indeed installed, but doesn't seem to be found... (Is there a way to 'force' the use of amdgpu?)
Btw, the problem occurs even with a Live USB of the latest snapshot of openSUSE Tumbleweed for example (with kernel 4.4.0-2 too), so it should be easily reproducible by owners of Tonga GPUs. (Well... I hope the problem is not openSUSE-specific...)