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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 - External monitor shows no signal after unplugging and plugging the cable back into dock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101462">101462</a>
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<th>Summary</th>
<td>External monitor shows no signal after unplugging and plugging the cable back into dock
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
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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
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>ethan.hsieh@canonical.com
</td>
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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>
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<pre>Created <span class=""><a href="attachment.cgi?id=131993" name="attach_131993" title="kernel log (drm.debug=0xe), Xorg.0.log, and xrandr">attachment 131993</a> <a href="attachment.cgi?id=131993&action=edit" title="kernel log (drm.debug=0xe), Xorg.0.log, and xrandr">[details]</a></span>
kernel log (drm.debug=0xe), Xorg.0.log, and xrandr
External monitor shows no signal after unplugging and plugging the cable back
into dock
Reproduction steps:
1. The external monitor with DP/mDP/HDMI cable connected to Dell Dock.
All two displays: Built-in LCD and external DP/mDP/HDMI monitor
2. Boot to Ubuntu Desktop
3. See two displays (extend mode)
4. Unplug the DP/mDP/HDMI cable from dock
5. wait for at least 30 seconds
6. Plug the cable back into dock
7. Check if the external monitor displays well
Additional information:
1. Kernel: 4.12.0-994-generic x86_64
2. Linux distribution: Ubuntu 16.04.2 LTS
3. Laptop: Dell Precision 5520
4. Dell Business Thunderbolt Dock - TB16
<a href="https://goo.gl/vFDjpi">https://goo.gl/vFDjpi</a>
5. Connector (kernel log):
[CONNECTOR:48:eDP-1]: Bulit-in LCD
[CONNECTOR:74:DP-4]: The external monitor
After unplugging and plugging in the cable back
[CONNECTOR:48:eDP-1]: Bulit-in LCD
[CONNECTOR:84:DP-5]: The external monitor
How to recover:
1. Go to [All Settings] => [Displays], Press [Detect Displays]
2. Run xrandr to resize the screen</pre>
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</p>
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