[Bug 101827] Tearing with i965 + modesetting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101827

            Bug ID: 101827
           Summary: Tearing with i965 + modesetting
           Product: Mesa
           Version: 17.1
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: moosotc at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

More details at:

https://lists.freedesktop.org/archives/intel-gfx/2017-July/133110.html
https://lists.freedesktop.org/archives/intel-gfx/2017-July/133244.html

On top of that I've updated the tearing demonstration code:
https://boblycat.org/~malc/teartest.c

This new version can take a command line argument - number of swaps per frame 
and when invoked like: "~/tmp/gl/teartest 2" will tear even without DRI3(i.e.
with DRI2) (though with some override-redirect magic outlined in the first
post)

With DRI3 it more or less always tears (fullscreen, nothing on top).

This leads me to suspsect that this is connected to bugs #97957 and #97173

My, perhaps naive, attempts to validate this hunch by compiling and using
Mesa/DRI from git head weren't entirely successful.

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