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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 - [regression] display corruption since bb0f4aab0e7677e9"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=101679">101679</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[regression] display corruption since bb0f4aab0e7677e9
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>DRI 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>tjaalton@ubuntu.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>We've bisected an issue with kernels since

commit bb0f4aab0e7677e91cde443fecc18e71fbb85038
Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
Date: Fri Jan 20 20:21:59 2017 +0200

    drm/i915: Track full cdclk state for the logical and actual cdclk
frequencies


Attaching a 4k monitor via a TB dock to a certain KBL machine results in
display corruption similar to this:

<a href="https://photos.google.com/share/AF1QipNgcr1DzxLQE40mUrNj_vbZUz_hfcsrsRONqHt-t01tjWsDDQzPfcigCN0BC5lkpg?key=YjRfZk03cFBDeUtYakRFdFVaRGdGLUQzcHhxNjZB">https://photos.google.com/share/AF1QipNgcr1DzxLQE40mUrNj_vbZUz_hfcsrsRONqHt-t01tjWsDDQzPfcigCN0BC5lkpg?key=YjRfZk03cFBDeUtYakRFdFVaRGdGLUQzcHhxNjZB</a></pre>
        </div>
      </p>


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