<html>
<head>
<base href="https://bugs.freedesktop.org/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Hang when reconnecting to an external monitor using a docked Lenovo T540p"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87327">87327</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Hang when reconnecting to an external monitor using a docked Lenovo T540p
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tytso@mit.edu
</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=110862" name="attach_110862" title="Dmesg after a resume">attachment 110862</a> <a href="attachment.cgi?id=110862&action=edit" title="Dmesg after a resume">[details]</a></span>
Dmesg after a resume
I've been having severe problems with docking with my Lenovo T540p using an
external dock (which uses a MST hub in the dock). The system will often
hang, crash, or simply not recognize the external monitor until I restart the X
server. I've documented a number of these problems on the dri-devel mailing
list for example, with the subject line "Re: WARNING:
/usr/projects/linux/linux/drivers/gpu/drm/i915/intel_pm.c:6585
intel_display_power_put+0x4b/0x116 [i915]()". This is a new one.
This morning, I was docked and using a Dell 30" monitor. I
reconfigured the X server to stop sending video to the external
monitor, suspended the laptop, and after it was suspended undocked it
and took it to work. Then I docked it at work, where it was connected
to a powered off Dell 24" monitor, the system competely hung. One of the
things that I've learned will unwedge the system after it hangs after unsuspend
is to eject the laptop from the dock, and wait. Eventually the system did
unwedge, and then I redocked it. Afterwards, I found the following in dmesg
and in /sys/class/drm/card0/error. (See attached.)</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are on the CC list for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>