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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Mathematica 3D graphics not displayed anymore with xf86-video-intel-2.99.912-125.1.x86_64"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=79999#c13">Comment # 13</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Mathematica 3D graphics not displayed anymore with xf86-video-intel-2.99.912-125.1.x86_64"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=79999">bug 79999</a>
              from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
        <pre>Ok, can you try

diff --git a/src/sna/sna_dri2.c b/src/sna/sna_dri2.c
index efc790f..3d3c50d 100644
--- a/src/sna/sna_dri2.c
+++ b/src/sna/sna_dri2.c
@@ -1485,6 +1485,8 @@ can_xchg(struct sna * sna,
        WindowPtr win = (WindowPtr)draw;
        PixmapPtr pixmap;

+       return false;
+
        if (draw->type == DRAWABLE_PIXMAP)
                return false;

to see if it using xchg swaps or if it is a side-effect of that patch on the
regular code that broke Mathematica?</pre>
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