https://bugs.freedesktop.org/show_bug.cgi?id=91522

            Bug ID: 91522
           Summary: Tonga display lock on agd5f  drm-next-4.3-wip since
                    drm/amdgpu: fix syncing to VM updates
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: adf.lists@gmail.com

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 -

commit 928db3aef53b0e74e26a6815890b6162cff2f4e7
Author: Christian König <christian.koenig@amd.com>
Date:   Mon Jul 27 15:40:35 2015 +0200

    drm/amdgpu: fix syncing to VM updates

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