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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BXT DP-MST] System hang/crash when plugging in USB typeC DP MST monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99572">99572</a>
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<th>Summary</th>
<td>[BXT DP-MST] System hang/crash when plugging in USB typeC DP MST monitor
</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>x86-64 (AMD64)
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<th>OS</th>
<td>other
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>critical
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>nathan.d.ciobanu@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
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=129186" name="attach_129186" title="stack trace">attachment 129186</a> <a href="attachment.cgi?id=129186&action=edit" title="stack trace">[details]</a></span>
stack trace
Steps to reproduce:
- Connect a 4K DP MST monitor to the USB-C port on a BXT system using a USB-C
to DP dongle while the system is up
- Or boot a BXT system with a 4K DP MST monitor attached to the USB-C port
using a USB-C to DP dongle
Result:
- The system hangs or reboots immediately.
Notes:
Tentative fix:
<a href="https://lists.freedesktop.org/archives/intel-gfx/2017-January/116654.html">https://lists.freedesktop.org/archives/intel-gfx/2017-January/116654.html</a>
Adds the missing INTEL_OUTPUT_DP_MST case in bxt_get_dpll() to correctly
initialize the crtc_state and port plls when link training a DP MST monitor
on BXT/APL devices.</pre>
</div>
</p>
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