Dell xps 15 9550 laptop,

sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
01.02.00
04/07/2016

I already tried http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc6-yakkety/
and it is worse then current kernel I am using 
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6.3-yakkety/

4.6.3 WD15 works if it is plugged while boot, and it can be unplugged but not 
replugged
4.7.3 WD15 worked if it is plugged while boot, but when unplugged extended 
monitor was reported still connected


** Tags added: kernel-bug-exists-upstream kernel-bug-exists-upstream-4.6.3 
kernel-bug-exists-upstream-4.7-rc6

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

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

Title:
  Thunderbolt hotplug causes system hang

Status in linux package in Ubuntu:
  Confirmed

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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