[Bug 111271] New: Black stripe on screen with MGAG200 (PowerEdge R320) and modesetting

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=111271

            Bug ID: 111271
           Summary: Black stripe on screen with MGAG200 (PowerEdge R320)
                    and modesetting
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.4
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: jean-yves.faye@c-s.fr
        Regression: No

Created attachment 201391
  --> https://bugzilla.kernel.org/attachment.cgi?id=201391&action=edit
dmesg

I use Xorg with modesetting driver on a R320 PowerEdge Dell server.

I've upgraded kernel from 3.10.40 to a newer version.

With the upgrade, a black horizontal stripe appears next to the pointer when
moving the mouse to the left edge of the screen. The stripe darker and wider on
 a CRT screen than a LCD screen it seems.

I've tested on 4.4 and the problem is still present.

I'm using Xorg with the modesetting driver, and the MGAG200 kernel module
(dmesg and Xorg.log attached)

I've run a git bisect on the kernel and identified the commit causing the
regression :

# first bad commit: [9125e6186822b2698da17690416cd1b55c030115] drm: Add
drm_plane_force_disable()

Unfortunately I'm not familiar with the GPU/DRM part of the kernel, so I can't
get this any further.

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