The bug itself is fixed in the 4.11.0-041100rc5-generic kernel. But I
encounter regular freezes with this version of the kernel, and I have
ACPI related error messages.

Here are the ACPI messages from the dmesg : 
[    6.090510] ACPI Warning: \_SB.IETM._ART: Return Package type mismatch at 
index 0 - found Integer, expected Reference (20170119/nspredef-297)
[    6.090530] ACPI: Invalid package element [0]: got number, expecting [R]
[    6.090531] _ART package 0 is invalid, ignored
[    6.090563] ACPI Warning: \_SB.IETM._TRT: Return Package has no elements 
(empty) (20170119/nsprepkg-130)


** Tags added: kernel-fixed-upstream

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

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https://bugs.launchpad.net/bugs/1677575

Title:
  Thunderbolt hotplug causes system hang

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have a problem similar to the bug #1599476, my system freezes when I
  unplug my thunderbolt port if it is connected during startup.

  What I have tested so far : 
  * If the thunderbolt is plugged at startup and I unplug it -> System freeze
  * If the thunderbolt is not plugged at startup, I can plug it and unplug it 
fine. 

  What I expect to happen : 
  Being able to unplug my thunderbolt without the system freezing. 

  I updated my BIOS and the firmware of the dock : 
  13:47 troche@serenity ~ % sudo dmidecode -s bios-version && sudo dmidecode -s 
bios-release-date
  1.2.19
  12/22/2016

  This was working fine in Ubuntu 16.04, and it is not working since my update 
to Ubuntu 16.10.
  13:47 troche@serenity ~ % lsb_release -rd
  Description:  Ubuntu 16.10
  Release:      16.10

  My computer is a Dell Precision 5510 laptop with a dock WD15
  Thunderbolt.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-image-4.8.0-41-generic 4.8.0-41.44
  ProcVersionSignature: Ubuntu 4.8.0-41.44-generic 4.8.17
  Uname: Linux 4.8.0-41-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   troche     2945 F...m pulseaudio
   /dev/snd/controlC0:  troche     2945 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Mar 30 13:41:26 2017
  HibernationDevice: RESUME=UUID=65e0fb0a-8046-4428-bb89-53d36638d70a
  InstallationDate: Installed on 2016-08-24 (218 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  MachineType: Dell Inc. Precision 5510
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-41-generic 
root=UUID=7510dd66-3e56-446f-b39c-71724a228d07 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-4.8.0-41-generic N/A
   linux-backports-modules-4.8.0-41-generic  N/A
   linux-firmware                            1.161.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to yakkety on 2017-03-27 (3 days ago)
  dmi.bios.date: 12/22/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.2.19
  dmi.board.name: 0N8J4R
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.2.19:bd12/22/2016:svnDellInc.:pnPrecision5510:pvr:rvnDellInc.:rn0N8J4R:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision 5510
  dmi.sys.vendor: Dell Inc.

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