*** This bug is a duplicate of bug 1577898 ***
    https://bugs.launchpad.net/bugs/1577898

A patch https://patchwork.kernel.org/patch/10212201/ is going to fix
this issue properly, it should be backported to older kernels too, so
hopefully going forward your USB-C connectors will work correctly, it
also fixes NVMe drives disappearing after suspend too

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https://bugs.launchpad.net/bugs/1571859

Title:
  Thunderbolt 3 USB-C Port not "hotpluggable"

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have a Dell Precision 5510 with 16.04 Beta 2. The Thunderbolt3 port
  will provide power to devices, but will not recognize them when
  plugged in after boot.

  If a Thunderbolt USB-C to Ethernet adapter is plugged in on boot, the
  device is recognized and usable as an ethernet connection. However if
  it is removed and plugged back in, it is not recognized when
  reconnected.

  I also have a Nexus 6P Android phone with USB-C. The laptop will
  provide power to the phone but will not recognize it as a connected
  device, even when attached at boot. This may be a related issue or
  something else entirely, but wanted to pass along none the less.

  I do not have any other USB-C/Thunderbolt adapters to test with at
  this time.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-18-generic 4.4.0-18.34
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  kgochenour   3218 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Apr 18 17:28:29 2016
  HibernationDevice: RESUME=UUID=dbb01b4f-200c-47f8-aba9-c12e41ee127d
  InstallationDate: Installed on 2016-04-10 (7 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0c45:6713 Microdia 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Precision 5510
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-18-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-18-generic N/A
   linux-backports-modules-4.4.0-18-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 01.01.19
  dmi.board.name: 0W7V82
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr01.01.19:bd01/25/2016:svnDellInc.:pnPrecision5510:pvr:rvnDellInc.:rn0W7V82:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision 5510
  dmi.sys.vendor: Dell Inc.

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