[Bug 101462] [SKL] External monitor shows no signal after unplugging and plugging the cable back into dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101462

Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEEDINFO

--- Comment #15 from Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> ---
(In reply to Ethan Hsieh from comment #0)
> Created attachment 131993 [details]
> 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
> https://goo.gl/vFDjpi
> 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

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.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170815/4ab2284d/attachment.html>