[Bug 103489] [Regression bisected]: vblank time outs and machine hangs on RX560 drm-next-4.15-dc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103489

            Bug ID: 103489
           Summary: [Regression bisected]: vblank time outs and machine
                    hangs on RX560 drm-next-4.15-dc
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: oschowa at web.de

Created attachment 135115
  --> https://bugs.freedesktop.org/attachment.cgi?id=135115&action=edit
dmesg

Running the most recent code of agd5f/drm-next-4.15-dc leads to dmesg spam
about vblank time outs (see attachment) and eventual full machine hangs when a
4k screen is connected to my RX560. The maching does not hang if only a 1080p
screen is connected and it was running fine on commit  
d7205d5c0f2b09d900231de9026b97105c37d343.
Bisecting produced d050f8ed14494ea23c6e10b5893010946ef0f78b as the first bad
commit, although on this commit the machine hangs immediatly after boot, so it
might be a different issue.

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