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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 - Segfault and other crashes on Intel(R) HD Graphics 5500 (Dell E7450) while switching between external displays and integreated"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94766">94766</a>
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<th>Summary</th>
<td>Segfault and other crashes on Intel(R) HD Graphics 5500 (Dell E7450) while switching between external displays and integreated
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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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>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</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>
<tr>
<th>Reporter</th>
<td>slawek@otwiera.cz
</td>
</tr>
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<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>
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<pre>Created <span class=""><a href="attachment.cgi?id=122642" name="attach_122642" title="Previous boot dmesg: journalctl -k -b -1">attachment 122642</a> <a href="attachment.cgi?id=122642&action=edit" title="Previous boot dmesg: journalctl -k -b -1">[details]</a></span>
Previous boot dmesg: journalctl -k -b -1
This happens randomly - I have no 100% reproducible way of doing this. I am
suffering random problems when docking/undocking with (and simple script
reacting on udev changes to execute specific xrandr commands, just --output
--left-of and like that).
There've been actually three issues:
1) All displays black after docked or undock (this was last reproduced on
kernel 4.4.5, not testing 4.4.6 and following issues 2 and 3 were already
reproduced)
Original bug report: <a href="https://bugzilla.kernel.org/show_bug.cgi?id=115511">https://bugzilla.kernel.org/show_bug.cgi?id=115511</a>
Copy'n'paste:
* Facts
** Video freezes from time to time (randomly) after Dell E7450 being plugged
into docking station with two external FHD displays attached (DP1-1 and DP1-2
in xrandr).
** I've got background shell script running which detects udev change and
calls xrandr to enable two external displays - so this issue might happend
after xrandr command or after plug-event itself (not really able to verify, it
will be difficult to work without it running)
** I was hitting shutdown button after crash, so there might be
shutdown-related events in log (at the end, I've hold it until system halted)
* Guesses
** According to LEDs (not tested with SSH yet) system is responding
normally after video freeze - disk LED blinks from time to time.
** One of external monitors might be already reading „empty signal” (if I
understand correctly, it is no longer reporting that there is no signal, but
instead it acts like there is perfectly black image displayed)
* Attachments
** dmesg log from the crashed boot.
2) Laptop plugged out of docking station become unresponsive
* Black screen
* Unable to shutdown with short-powerbutton-press (what normally works).
* Had to hold power button for hard shutdown.
* Unfortunately, no logfile here.
3) Segfault when plugging into docking station
* Plugged into docking station, saw login manager screen on external
displays (X crashed and restarted into SLIM)
* Xorg.0.log attached
Some specs:
[otwieracz@odyssey:~]$ uname -a
Linux odyssey 4.4.6 #1-NixOS SMP Wed Mar 16 15:43:17 UTC 2016 x86_64 GNU/Linux
[otwieracz@odyssey:~]$ X -version
X.Org X Server 1.17.4
Release Date: 2015-10-28
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.14.54 x86_64
Current Operating System: Linux odyssey 4.4.6 #1-NixOS SMP Wed Mar 16 15:43:17
UTC 2016 x86_64
Kernel command line:
initrd=\efi\nixos\zzdi7fgmpik03vpl9l6699q1ggdgj7hr-initrd-initrd.efi
systemConfig=/nix/store/f6abzlbdj2i5j2lv631wpd109n8bn996-nixos-system-odyssey-16.09.git.32b7b00
init=/nix/store/f6abzlbdj2i5j2lv631wpd109n8bn996-nixos-system-odyssey-16.09.git.32b7b00/init
loglevel=4
Build Date: 24 March 2016 05:38:17PM
Current version of pixman: 0.34.0
Before reporting problems, check <a href="http://wiki.x.org">http://wiki.x.org</a>
to make sure that you have the latest version.</pre>
</div>
</p>
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