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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 - [i915][BYT] Blank screen on MIPI panel"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=101205">101205</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[i915][BYT] Blank screen on MIPI panel
          </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>dimitry@cos.flag.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=131526" name="attach_131526" title="Syslog for the faulty Pipo X8 (Z3735F) unit">attachment 131526</a> <a href="attachment.cgi?id=131526&action=edit" title="Syslog for the faulty Pipo X8 (Z3735F) unit">[details]</a></span>
Syslog for the faulty Pipo X8 (Z3735F) unit

I have two very similar Baytrail devices: Pipo X8 and Pipo X8S.

The former (X8) is based on Z3736F and runs fine. The latter (X8S) is based on
Z3735F and gets a blank screen once the i915 driver is loaded.

Both units run identical set up software-wise:

distro: Gentoo
kernel: drm-tip branch (713f8e of 16 May)
xorg: 1.19.2
xf86-video-intel: 2.99.917_p20170216

Comparing the logs I can see the faulty unit seems to be missing some MIPI
initialization commands. Here is the diff of the logs between the good unit
(left) and the faulty one (right):

<a href="https://www.diffchecker.com/tv4c7jTl">https://www.diffchecker.com/tv4c7jTl</a>

The HDMI output on the faulty unit works fine. Attached are the logs for both
the good and the faulty units with drm.debug=0x1e</pre>
        </div>
      </p>


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