[Bug 97596] New: [SKL] [regression] Flickering artefact window at top left of screens in kernel 4.8-rc5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97596

            Bug ID: 97596
           Summary: [SKL] [regression] Flickering artefact window at top
                    left of screens in kernel 4.8-rc5
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: rockorequin at hotmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126212
  --> https://bugs.freedesktop.org/attachment.cgi?id=126212&action=edit
syslog for 4.8-rc5

I am seeing a flickering artefact window at the top left of my monitors when I
use 4.8-rc4 and -rc5 on my Skylake GPU using the modeset driver in Ubuntu 16.10
on an XPS 15 9550.

The artefact looks a bit like a small black gnome-terminal window with white
text inside at the top left of the monitor (it's not the same as my actual
gnome-terminal window, which has orange text in it) and flickers rapidly in and
out of existence for maybe half a second to a second when it is triggered.

I see the the artefact at the top of both my HDMI external monitor and the
laptop internal monitor (I have them set up with the external monitor on top,
in case that's relevant). IIRC it appears on the display where the mouse is
currently.

I find it is triggered reasonably consistently by moving the mouse between
monitors or by clicking on a gnome-terminal window to focus it and then
pressing a key.

It makes the desktop unusable so I would rate it higher than normal (for me
it's a blocker).

The artefact wasn't present in kernels 4.4 through 4.7.

I can't see anything in particular in the log (attached) that is related to the
flickering. drm logs some CPU buffer underrun messages and also one saying "GuC
firmware load skipped", which doesn't happen with kernel 4.7.2.

I don't think this is bug https://bugs.freedesktop.org/show_bug.cgi?id=97450,
because that one seems to be talking about full-screen flickering and there it
occurs randomly and only on the external monitor.

I think the artefact I'm seeing is mentioned in
https://bugs.freedesktop.org/show_bug.cgi?id=97242 (comment 6), but that bug
was primarily about another issue and has been closed.

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