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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 - Random freezes with multiple displayport monitors connected to Thinkpad X260 with ultradock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96714">96714</a>
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<th>Summary</th>
<td>Random freezes with multiple displayport monitors connected to Thinkpad X260 with ultradock
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</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>critical
</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>
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<th>Reporter</th>
<td>dxtr@emacs.church
</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>
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<pre>Created <span class=""><a href="attachment.cgi?id=124769" name="attach_124769" title="Journal">attachment 124769</a> <a href="attachment.cgi?id=124769&action=edit" title="Journal">[details]</a></span>
Journal
As discussed on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - BUG: unable to handle kernel NULL pointer dereference at 0000000000000470"
href="show_bug.cgi?id=96554">https://bugs.freedesktop.org/show_bug.cgi?id=96554</a> and
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - intel_fbdev_restore_mode derefence null pointer"
href="show_bug.cgi?id=93580">https://bugs.freedesktop.org/show_bug.cgi?id=93580</a> I experience random freezes
when I have connected two displayport monitors.
I can see no pattern in when and how it happens.
I am attaching the log from one session when it happened (booted with
drm.debug=0xe).
As of this writing I am running kernel version 4.7.0-rc5 with patches from
<a href="https://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=for-bug93580">https://cgit.freedesktop.org/~ickle/linux-2.6/log/?h=for-bug93580</a>.
The symptom is that the two external monitors just goes black and the display
on the laptop sort of fades to noise that gets darker and darker until it's
completely black.
The system is, from what I can see, totally unresponsive. I can't even SSH into
it to try to figure out what's happening.
And as you can see in the log it simply just stops logging.
Maybe this is a hint?
Earlier today I also saw an interesting extra effect.
The system had frozen up like this while I wasn't nearby.
This has never happened before (It was always happened when I've been doing
stuff) and because I wasn't nearby I didn't know how long it had been like
that.
When I finally booted the computer up again some of the noise was still on the
screen for an hour or so until it had slowly faded away.
It was even there in pre-bootloader.</pre>
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