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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IGT][SKL] DP hotplug test with Chamelium failing with DP MST hub"
href="https://bugs.freedesktop.org/show_bug.cgi?id=102479">102479</a>
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<th>Summary</th>
<td>[IGT][SKL] DP hotplug test with Chamelium failing with DP MST hub
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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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
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>paul.kocialkowski@linux.intel.com
</td>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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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=133879" name="attach_133879" title="IGT log">attachment 133879</a> <a href="attachment.cgi?id=133879&action=edit" title="IGT log">[details]</a></span>
IGT log
The dp-hpd chamelium subtest fails when executed with a DP MST hub. The test
consists of plugging/unplugging the connector in succession and checking that a
HOTPLUG=1 uevent is received each time. It works fine without a DP MST hub.
The two DP connectors of the Chamelium are connected to a 3-to-1 DP MST hub
that is connected to the DP-2 port of the machine. After pushing the SCAN
button on the hub, the new connectors are enumerated as DP-3 and DP-4. The test
is then executed and it fails to detect the first connector plug, through the
MST hub (see igt log and dmesg attached).
Information about the setup:
* Kernel: drm-tip c52f5322612a688655751c4dd44baa43e39d4dec
* Distro: Arch Linux (NOT using the distro's kernel)
* CPU: i5-6600K</pre>
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