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    <body><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> changed
              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [965gm] glitches"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90916">bug 90916</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Summary</td>
           <td>Graphics corruption on Dell Lattitude 1525 laptop
           </td>
           <td>[965gm] glitches
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [965gm] glitches"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90916#c4">Comment # 4</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [965gm] glitches"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90916">bug 90916</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>My presumption here is that it is mmap(wc) playing up.

diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index 0178df7..11e80f9 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -83,7 +83,7 @@ search_snoop_cache(struct kgem *kgem, unsigned int num_pages,
unsigned flags);
 #define DBG_NO_FAST_RELOC 0
 #define DBG_NO_HANDLE_LUT 0
 #define DBG_NO_WT 0
-#define DBG_NO_WC_MMAP 0
+#define DBG_NO_WC_MMAP 1
 #define DBG_NO_BLT_Y 0
 #define DBG_NO_SCANOUT_Y 0
 #define DBG_NO_DETILING 0

is perhaps the simplest way of testing.</pre>
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