[Bug 101441] New: Artifacts that follow the mouse cursor in dual screen setups

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101441

            Bug ID: 101441
           Summary: Artifacts that follow the mouse cursor in dual screen
                    setups
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: conselvan2 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131969
  --> https://bugs.freedesktop.org/attachment.cgi?id=131969&action=edit
dmesg log: boot with eDP; HDMI hotplugged later

Some dual screen setups are currently broken. All the scanlines below the mouse
cursor are wrong, sometimes containing a shade of gray and others repeating the
image above it. I've seen this in APL and GLK using DSI+HDMI, eDP+HDMI and
DSI+DP. In the DP case, however, the screen goes blank and reports lack of
signal.

git bisect points at 

commit bb9d85f6e9de8fef5236c076530eab67a2f2431b
Author: Kumar, Mahesh <mahesh1.kumar at intel.com>
Date:   Thu Jun 1 11:29:18 2017 +0530

    drm/i915/skl: New ddb allocation algorithm

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