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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - DP audio does not work with Thinkpad Ultra Dock and DP-to-HDMI converter"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103786">103786</a>
</td>
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<th>Summary</th>
<td>DP audio does not work with Thinkpad Ultra Dock and DP-to-HDMI converter
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>jan@3e8.eu
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=135529" name="attach_135529" title="dmesg: Dock DP connector with converter">attachment 135529</a> <a href="attachment.cgi?id=135529&action=edit" title="dmesg: Dock DP connector with converter">[details]</a></span>
dmesg: Dock DP connector with converter
I'm using a T460 with the Thinkpad Ultra Dock (contains Synaptics DP MST hub)
and a DP-HDMI converter (CAC-1070, based on PS176) to connect a 4K TV.
In this configuration the DP audio output is detected, but no audio can
actually be heard. When connecting directly via HDMI or using the converter on
the internal DP port of the laptop, audio works fine.
I have attached the dmesg output with drm.debug=0xe for the following test
cases:
Dock DP connector with converter -> no audio
Internal DP connector with converter -> audio works
Dock HDMI connector -> audio works
Internal HDMI connector -> audio works</pre>
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