Tried agd5f drm-next-4.3-wip without enabling anything new. agd5f mesa/drm amdgpu.
I can startx but doing anything 3d/vdpau results in a display lock.
Nothing is logged, there is no gpu reset. SysRq works (and gets logged).
bisecting using glxgears to trigger came up with -
Author: Christian König <email@example.com>
Date: Mon Jul 27 15:40:35 2015 +0200
drm/amdgpu: fix syncing to VM updates
This doesn't happen on current drm-next-4.3-wip
Tested in release 14 in the build 1.0.12 on 11/27/2015 , working fine no issue