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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - SNA driver has again some artifacts"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=60402#c1">Comment # 1</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - SNA driver has again some artifacts"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=60402">bug 60402</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>Actually that looks like one of the rendering artifacts of <a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED --- - [sna gen4] corrupt rendering (and flickering on redraw)"
   href="show_bug.cgi?id=55500">bug 55500</a>. But it
could conceivably be a bug in the trapezoid mask generation, however that would
be deterministic.

I'll leave this open for a few days in case you can narrow down the
cause/effect, but for the time being I'm going to consider it as just another
gen4 misrendering bug.</pre>
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