[Bug 98504] New: graphical artefacts while resizing windows

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98504

            Bug ID: 98504
           Summary: graphical artefacts while resizing windows
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: cristi.magherusan at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 127626
  --> https://bugs.freedesktop.org/attachment.cgi?id=127626&action=edit
Video showing the issue in firefox

I noticed this on some applications after updating my Ubuntu 16.10 to the
4.9-rc2 kernel from the mainline PPA. I then updated to 4.9-rc3 and it behaves
the same. This wasn't happening on 4.8 so I suspect it has to do with the
kernel update.

It is always reproducing with Firefox and pinta(both based on GTK+) and
Skype(based on Qt), but won't reproduce on other apps(like eog, also based on
GTK+) so it is unlikely to be a toolkit bug, but I've also sometimes seen it in
the lightdm lock screen, depending on the resolution.

On both Skype and Firefox it doesn't affect the topmost part of the windows, as
you can see in the attached video.

I tried to measure the size of the blocks using gimp and they are roughly
480x160 pixels, and the blocks appear to be shuffled/interchanged always within
the same row, so I guess this may be some kind of memory referencing issue.

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