IbeeX, this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1599476/comments/10
regarding this being fixed with a BIOS update and dock firmware update.
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** Changed in: linux (Ubuntu)
   Importance: Low => Undecided

** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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https://bugs.launchpad.net/bugs/1599476

Title:
  Thunderbolt hotplug causes system hang

Status in linux package in Ubuntu:
  Invalid

Bug description:
  Description:    Ubuntu 16.04 LTS
  Release:        16.04

  Hot-plugging Dell's WD15 Thunderbolt cause a system panic with regular
  kernel 4.4.0-28. Using http://kernel.ubuntu.com/~kernel-
  ppa/mainline/v4.6.3-yakkety/ kernel. WD15 works if it is connected to
  laptop during boot time. Hot-plugg causes system hang

  What you expected to happen:
  Hot-plugg WD15 thunderbolt 
(http://www.dell.com/support/article/us/en/04/SLN301105) all features should 
work (USB, sound-card, port replication...)
  What happened instead:
  Display port on WD15 works, USB replication don't work sound-card don't work 
and eventually system hangs.
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-05-04 (63 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
  Package: linux (not installed)
  Tags:  xenial
  Uname: Linux 4.6.3-040603-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True

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