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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Corruption in Firefox 30 or later"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=79517#c4">Comment # 4</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Corruption in Firefox 30 or later"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=79517">bug 79517</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>Idea:

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index 2513b8b..18195d8 100644
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -4564,7 +4564,8 @@ try_upload_tiled_x(PixmapPtr pixmap, RegionRec *region,
                        DBG(("%s: discarding dirty pixmap\n", __FUNCTION__));
                        sna_pixmap_free_gpu(sna, priv);
                }
-               replaces = true; /* Mark it all GPU damaged afterwards */
+               replaces = (priv->cpu_damage == NULL ||
+                           region_subsumes_damage(region, priv->cpu_damage));
        }

        if (priv->gpu_bo == NULL &&</pre>
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