[Bug 96686] New: Laptop main panel goes blank when the mouse cursor is in it while an external monitor is plugged in

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96686

            Bug ID: 96686
           Summary: Laptop main panel goes blank when the mouse cursor is
                    in it while an external monitor is plugged in
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: roc at ocallahan.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Dell XPS 9550 laptop (Skylake). I have various graphics issues but currently
the most serious one is that usually when I plug an external monitor (Dell 4K)
into the HDMI port, the main laptop screen goes blank whenever the mouse cursor
is in it.

I'm using the full 4K resolution of the external monitor so it only runs at
30Hz given the HDMI limitation.

uname -a:
Linux glory 4.5.7-300.fc24.x86_64 #1 SMP Wed Jun 8 18:12:45 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux
Kernel command line parameters added:
nouveau.modeset=0 acpi_osi=Linux i915.enable_rc6=0

Repeated attempts to unplug and replug the external monitor eventually resolve
the issue (until the next time I need to move my laptop).

dmesg shows "WARN_ON(!wm_changed)" on every replug but my symptoms aren't
mentioned by other users reporting that issue, hence this new bug report.

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