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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [HSW ULT desktop mobile bisected] Slow resume time"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=65922">65922</a>
          </td>
        </tr>

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

        <tr>
          <th>Summary</th>
          <td>[HSW ULT desktop mobile bisected] Slow resume time
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>major
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>cancan.feng@intel.com
          </td>
        </tr>

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

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
      <p>
        <div>
        <pre>System Environment:
--------------------------
Platform: Haswell ULT, Haswell desktop, Haswell mobile
Kernel: (drm-intel-next-queued)04c23c6203954cc38a34c86b4dd0686a1b1a53de
Author: Paulo Zanoni <<a href="mailto:paulo.r.zanoni@intel.com">paulo.r.zanoni@intel.com</a>>
Date:   Wed Jun 12 17:27:30 2013 -0300

Bug detailed description:
-------------------------
I did suspend-resume cycle of S3 on latest drm-intel-next-queued kernel, and
found that resume time slower than expectation. This happens on all HSW
platforms, and I have bisected it on HSW desktop, and it's applicable for the
other two platforms. 

Bisect info:
-------------------------
24576d23976746cb52e7700c4cadbf4bc1bc3472 is the first bad commit

commit 24576d23976746cb52e7700c4cadbf4bc1bc3472
Author: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
Date:   Tue Mar 26 09:25:45 2013 -0700

    drm/i915: enable VT switchless resume v3

    With the other bits in place, we can do this safely.

    v2: disable backlight on suspend to prevent premature enablement on resume
    v3: disable CRTCs on suspend to allow RTD3 (Kristen)

    Signed-off-by: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
    Reviewed-by: Rodrigo Vivi <<a href="mailto:rodrigo.vivi@gmail.com">rodrigo.vivi@gmail.com</a>>
    Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>


Following table shows the bad value(from first bad commit) compared with good
value(from first-bad-commit's father commit) of HSW desktop:

resume time:
-------------------------------------
Display ports    eDP               HDMI                  DP
Bad            710.256msecs       262.942msecs       190.676msecs 
Good         52.750msecs       56.695msecs          67.484msecs</pre>
        </div>
      </p>
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