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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 - connecting dell UP3214Q to mac book pro hangs computer"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=90943">90943</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>connecting dell UP3214Q to mac book pro hangs computer
          </td>
        </tr>

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

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

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (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>ken@kenjo.org
          </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>Created <span class=""><a href="attachment.cgi?id=116446" name="attach_116446" title="oops.">attachment 116446</a> <a href="attachment.cgi?id=116446&action=edit" title="oops.">[details]</a></span>
oops.

Connecting the display over mini displayport (thunderbolt connector) hangs the
laptop.

when doing this while displaying the desktop I get nothing computer just dies
no logs no nothing, it just freezes.

If I switch to console mode before connecting the cable I get the attached
output from the kernel.

kernel version is 

Linux retina 4.0.5-040005-generic #201506061639 SMP Sat Jun 6 16:40:45 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux

os is ubuntu 15.04

I tried with the thunderbolt module loaded or unloaded same result.</pre>
        </div>
      </p>
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