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      <base href="https://bugs.freedesktop.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [hsw] i915 resume latency 909 ms"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=100540">100540</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[hsw] i915 resume latency 909 ms
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>XOrg git
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>jani.nikula@intel.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Moving from <a href="https://bugzilla.kernel.org/show_bug.cgi?id=76211">https://bugzilla.kernel.org/show_bug.cgi?id=76211</a> reported by Len
Brown.

The last observation there was:

This problem still exists in Linux-4.8.0, though the delay
on this machine is now 909 ms, rather than 1,200 ms.

Attached, please find the analzye_suspend.py output as run
on the same laptop as above, installed with Ubuntu 16.10
and its 4.8.0-22-generic kernel.

Curiously, i915 resume invokes intel_hdmi_detect FOUR TIMES --
twice in a kthread, and again twice in-line.  This costs 160ms
each time it is invoked.</pre>
        </div>
      </p>


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