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.