[Bug 101314] [DP] [SKL] Auido process is lost after hotplug event through MST dongle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101314

--- Comment #5 from Ricardo Madrigal <ricardox.madrigal.maldonado at intel.com> ---
[DP] [BDW] Auido process is lost after hotplug event through MST dongle 

I am testing with monitor Asus 1080 and  MST Dongle "Sinix". When I unplug DP
from the out of the dongle, I lose audio and video signal, but if i unplug
direct DP connection, platform to MST, everything works fine   

This is my configuration 
--------------------------------------------------
======================================
             Hardware
======================================
platform                   : BDW
motherboard id             : NUC5i7RYB
form factor                : Desktop
cpu family                 : Core i7
cpu family id              : 6
cpu information            : Intel(R) Core(TM) i7-5557U CPU @ 3.10GHz
gpu card                   : Intel Corporation Iris Graphics 6100 (rev 09)
(prog-if 00 [VGA controller])
memory ram                 : 15.58 GB
max memory ram             : 16 GB
display resolution         : 1600x900
cpu thread                 : 4
cpu core                   : 2
cpu model                  : 61
cpu stepping               : 4
socket                     : Socket BGA1168
signature                  : Type 0, Family 6, Model 61, Stepping 4
hard drive                 : 111GiB (120GB)
current cd clock frequency : 337500 kHz
maximum cd clock frequency : 540000 kHz
displays connected         : DP-2

======================================
             Software
======================================
kernel version              : 4.12.0-rc3-drm-tip-ww22-commit-187376e+
architecture                : x86_64
os version                  : Ubuntu 17.04
os codename                 : zesty
kernel driver               : i915
bios revision               : 5.6
bios release date           : 05/11/2017


======================================
              Kernel 
======================================
commit:  187376e

--------------------------------------
Steps to reproduce:
--------------------------------------

1. Connect a DP monitor, less than 4k  audio capable to your MST dongle
2. Boot up and login with your credentials in to UI
3. Open a terminal and start playing an audio file $ aplay <file>
4. During playback unplug DP cable from MST hub
5. Plug back DP cable

------------------------------------------
Expected results:
------------------------------------------
The audio should pause during unplug/plug event without closing audio thread

---------------------------------------------
Actual Result:
---------------------------------------------
Audio and video is lost.

--------------------------------------------------

Attaching dmesg

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