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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 - [KBL] MST monitors not detected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101602">101602</a>
</td>
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<th>Summary</th>
<td>[KBL] MST monitors not detected
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<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>nutello@sweetness.com
</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=132257" name="attach_132257" title="dmesg with drm.debug=0xe">attachment 132257</a> <a href="attachment.cgi?id=132257&action=edit" title="dmesg with drm.debug=0xe">[details]</a></span>
dmesg with drm.debug=0xe
I have a new Dell XPS 13 9360. According to drm logs: platform=KABYLAKE gen=9
pciid=0x5926 rev=0x06. I updated from Ubuntu 16.04 to 17.04 and installed Linux
4.12-rc7 (from today).
I also have two Dell U2715H monitors (2560x1440) set up for DP1.2/MST. They
worked well for the past couple of years with a XPS 13 9343 (Broadwell), using
a mini-DP to DP cable.
I'm trying to switch to the new laptop, but it doesn't seem to recognise the
monitors at all. It never did. I am using a Google USB-C to DP cable. If I
revert the monitors back to DP1.1, the first one is detected, but
daisy-chaining won't work (of course). I also have a Dell dock, but I use it
only as a glorified USB and Ethernet hub. In case you're wondering, I don't use
it for anything more, because its USB audio tends to lock up and the gross,
CPU-draining DisplayLink software/hardware hack is utter garbage (to be kind).
Anyway, what really puzzles me about the Kaby Lake laptop is that this is a
regression from two years ago.
I'm attaching dmesg output with drm.debug=0xe. Please advise. The old laptop
sometimes has terrifying loud POST errors about the built-in LCD screen, so
switching to the new one would be timely. :-)</pre>
</div>
</p>
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