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

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