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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 - [HSW] system hang when connected DP MST monitor is powered on"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93489">93489</a>
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<th>Summary</th>
<td>[HSW] system hang when connected DP MST monitor is powered on
</td>
</tr>
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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)
</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>nathan.d.ciobanu@linux.intel.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>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=120670" name="attach_120670" title="kernel.log">attachment 120670</a> <a href="attachment.cgi?id=120670&action=edit" title="kernel.log">[details]</a></span>
kernel.log
Using a Dell P2715Q monitor with the DP MST feature turned on as "Primary" and
connected directly to a HSW Lenovo ThinkPad L440 running ArchLinux and
drm-intel-nightly of 12/22/2015 causes the system to hang when the monitor got
turned off and subsequently turned on. Kernel log with the stack dump is
attached.
Steps to reproduce:
--------------------
- Turn on the MST feature on the Dell P2715Q as 'Primary'
- Connect it to the ThinkPad L440 using a mDP to DP cable (mDP port on the TP
-> DP-in on the monitor)
- ThinkPad is running only ArchLinux without any window server
- Boot the ThinkPad - make sure the Dell monitor displays the ThinkPad UI
- Turn off the Dell monitor by pressing its power button
- After a couple of seconds (time is probably irrelevant) press the ower button
on the monitor to turn it ON
- ThinkPad hangs and needs a PO/PO to recover
System configuration
---------------------
- PC: Lenovo ThinkPad L440
- CPU Architecture: x86_64
- Model name: i5-4300M
- Clock: 2.6GHz
- Memory: 8GB RAM
- Kernel: 4.4.0-rc6-12_22_2015-00913-g7e671e6
- Distro: ArchLinux</pre>
</div>
</p>
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