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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [965g] batch corruption, clflush?"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=61477#c27">Comment # 27</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [965g] batch corruption, clflush?"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=61477">bug 61477</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>Can you please refresh my memory on what the corruption looks like with a
screenshot or photograph? It would also be interesting to note if the
corruption is not apparent in a screenshot.

To undo the optimisation again, apply:

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index a3e4ed4..4b091f3 100644
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -58,7 +58,7 @@
 #define FORCE_INPLACE 0
 #define FORCE_FALLBACK 0
 #define FORCE_FLUSH 0
-#define FORCE_FULL_SYNC 0 /*
<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [ilk] Corrupted rendering of page previews in Firefox with >xf86-video-intel-2.20.18"
   href="show_bug.cgi?id=61628">https://bugs.freedesktop.org/show_bug.cgi?id=61628</a> */
+#define FORCE_FULL_SYNC 1 /*
<a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [ilk] Corrupted rendering of page previews in Firefox with >xf86-video-intel-2.20.18"
   href="show_bug.cgi?id=61628">https://bugs.freedesktop.org/show_bug.cgi?id=61628</a> */

 #define DEFAULT_TILING I915_TILING_X</pre>
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