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      <base href="https://bugs.freedesktop.org/" />
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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 mobile S3 Regression] Resume from S3, dmesg with "[drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 41000""
   href="https://bugs.freedesktop.org/show_bug.cgi?id=67517">67517</a>
          </td>
        </tr>

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

        <tr>
          <th>Summary</th>
          <td>[HSW mobile S3 Regression] Resume from S3, dmesg with "[drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 41000"
          </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>yangweix.shui@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>Created <span class=""><a href="attachment.cgi?id=83263" name="attach_83263" title="dmesg: S3 resume with error">attachment 83263</a> <a href="attachment.cgi?id=83263&action=edit" title="dmesg: S3 resume with error">[details]</a></span>
dmesg: S3 resume with error

Environment:
---------------------
Kernel: (drm-intel-next-queued)fae5cbff3e3e4097de2e76178d462b90626c2bdb
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Date:   Sun Jul 21 21:37:09 2013 +0200

    drm/i915: clean up crtc timings computation

HSW mobile msi product:
MSI Haswell Notebook MSI MS-16GC Notebook 15.6
Host bridge ID=0x0c04 (rev 06);
VGA ID=0x0416 (rev06)
CPU: i7-4700MQ 2.4GHz; 
BIOS: E16GCIMS.509 (04/24/2013) 
EC: 16GCEMS1 ver5.00 (04/12/2013);
ME: 9.0.2.1345;

Description:
--------------------
Test S3 with latest -next-queued kernel, there's drm error in dmesg:
[   66.639759] [drm:hsw_unclaimed_reg_check] *ERROR* Unclaimed write to 41000
[   66.639769] [drm:intel_uncore_check_errors] *ERROR* Unclaimed register
before interrupt

There's some ACPI and ALSA error,it's not our bug, and we have reported it in
<a class="bz_bug_link 
          bz_status_VERIFIED  bz_closed"
   title="VERIFIED NOTOURBUG - [HSW] Boot up with error information in dmesg"
   href="show_bug.cgi?id=66240">Bug #66240</a>.

I also test another HSW acer product, there's not this issue, but there's call
trace when resume from S3, you can see the status in <a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED --- - [HSW desktop mobile bisected] ddi pll tracking botch-up due to vt-switchless resume"
   href="show_bug.cgi?id=64379">Bug #64379</a>.

Reproduce step:
--------------------
1. boot machine up
2. S3
3. check dmesg

Bisect result:
--------------------
bf51d5e2cda5d36d98e4b46ac7fca9461e512c41 is the first bad commit
commit bf51d5e2cda5d36d98e4b46ac7fca9461e512c41
Author: Paulo Zanoni <<a href="mailto:paulo.r.zanoni@intel.com">paulo.r.zanoni@intel.com</a>>
Date:   Wed Jul 3 17:12:13 2013 -0300

    drm/i915: switch disable_power_well default value to 1

    Now that the audio driver is using our power well API, everything
    should be working correctly, so let's give it a try.</pre>
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