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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - i855gm: Display corruption in presence of graphics memory pressure"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=79843#c5">Comment # 5</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - i855gm: Display corruption in presence of graphics memory pressure"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=79843">bug 79843</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>And then please test

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index ac3867e..c9af183 100644
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -5487,7 +5487,7 @@ fallback:
                if (!sna_pixmap_move_to_cpu(pixmap, MOVE_READ | MOVE_WRITE))
                        goto free_boxes;

-               if (alu == GXcopy && pixmap->drawable.bitsPerPixel >= 8) {
+               if (alu == GXcopy && pixmap->drawable.bitsPerPixel >= 8 && 0) {
                        assert(pixmap->devKind);
                        if (sigtrap_get() == 0) {
                                FbBits *dst_bits, *src_bits;</pre>
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