<html>
    <head>
      <base href="https://bugs.freedesktop.org/" />
    </head>
    <body>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Intel driver crashes when undocking Lenovo T450s"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=94250#c4">Comment # 4</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Intel driver crashes when undocking Lenovo T450s"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=94250">bug 94250</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>Hmm. First thought is that the kernel returned an event for an operation that
failed, can you please quickly try with

diff --git a/src/sna/sna_dri2.c b/src/sna/sna_dri2.c
index fcfbd9d..7db6f61 100644
--- a/src/sna/sna_dri2.c
+++ b/src/sna/sna_dri2.c
@@ -1914,6 +1914,7 @@ sna_dri2_flip(struct sna_dri2_event *info)
                return false;
        }

+       assert(!info->queued);
        if (!sna_page_flip(info->sna, bo, sna_dri2_flip_handler,
                           info->type == FLIP_ASYNC ? NULL : info))
                return false;

and --enable-debug.</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are the QA Contact for the bug.</li>
      </ul>
    </body>
</html>