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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 - i915 external monitor not working in usb-c/thunderbolt dock on X1 gen6"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111250">111250</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>i915 external monitor not working in usb-c/thunderbolt dock on X1 gen6
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>DRM/Intel
</td>
</tr>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tmai@math.upb.de
</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=144909" name="attach_144909" title="dmesg while reproducing the error twice">attachment 144909</a> <a href="attachment.cgi?id=144909&action=edit" title="dmesg while reproducing the error twice">[details]</a></span>
dmesg while reproducing the error twice
Hi,
I cannot get external monitors to work on my X1 gen6 on Linux (Ubuntu) when
they are connected over a dock. I tried the official dock from lenovo as well
as an third-party usb-c adapter. The systems immediately freezes if I hotplug
an external monitor or it freezes when I try to configure the external monitor
(which is not enabled in the settings up to this point). It unfreezes when the
cable is disconnected. In some cases booting with the external monitor ended up
at a log-in screen with reduced screen resolution (below full HD).
Kernel: 5.3.0-994-generic
(from here: <a href="https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/2019-07-27/">https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/2019-07-27/</a>)
However, it affects various other kernel versions as well.
OS: Kubuntu 19.04
Machine: Lenovo X1 (Gen6); 20KGS03800
Display connector: HDMI and DP
dmesg is attached (external monitor was connected twice after boot up)
Additional info:
External monitors were working on Kubuntu 18.04 earlier this year. The other
day, I tried the livesystem 18.04.2 which is already affected by the bug.
Please, let me know if I can provide any further information from my end or
point me to any other place where I should report this bug instead.
Thanks to anyone who looks into this.</pre>
</div>
</p>
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