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<body><span class="vcard"><a class="email" href="mailto:dhinakaran.pandiyan@intel.com" title="Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>"> <span class="fn">Dhinakaran Pandiyan</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SKL] External monitor shows no signal after unplugging and plugging the cable back into dock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101462">bug 101462</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>REOPENED
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<td>NEEDINFO
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SKL] External monitor shows no signal after unplugging and plugging the cable back into dock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101462#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SKL] External monitor shows no signal after unplugging and plugging the cable back into dock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101462">bug 101462</a>
from <span class="vcard"><a class="email" href="mailto:dhinakaran.pandiyan@intel.com" title="Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>"> <span class="fn">Dhinakaran Pandiyan</span></a>
</span></b>
<pre>(In reply to Ethan Hsieh from <a href="show_bug.cgi?id=101462#c0">comment #0</a>)
<span class="quote">> 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</span >
Hi Ethan
I can't reproduce this with drm-tip and Ubuntu 17.04. The configuration I have
is a Dell TB16 dock, Dell XPS 13 9360 laptop and a Dell P2715Q external
monitor. Please upgrade packages on your device and retest.</pre>
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