Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.16 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:

Once testing of the upstream kernel is complete, please mark this bug as

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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

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  chaoskey interferes with suspend on thinkpad

Status in linux package in Ubuntu:

Bug description:
  Thinkpad T450s, docking station, Altus Metrum Chaoskey plugged into
  the docking station - suspend fails often (more than half the time,
  maybe not 100% but easily duplicated in my setup) in that it doesn't
  seem to go all the way down - and on wakeup, lsusb output doesn't
  update, `lsusb -t` hangs when run.  It *may* require "suspend, undock,
  unsuspend" but I'm not convinced...

  Interesting logs include a "blocked for more than 120 seconds"
  traceback after restore that goes through chaoskey_disconnect even
  though the laptop is undocked so it's no longer attached:

  [17038.103142] Call Trace:
    ? ttwu_do_activate+0x7a/0x90
    ? wake_up_q+0x80/0x80
  ***  chaoskey_disconnect+0xbe/0x110 [chaoskey] ***
    ? usb_remove_ep_devs+0x1f/0x30
    ? process_one_work+0x410/0x410
    ? kthread_create_worker_on_cpu+0x70/0x70
    ? do_syscall_64+0x73/0x130
    ? SyS_exit_group+0x14/0x20

  Kernel is most recently `4.15.0-13-generic #14-Ubuntu` but it's been
  going on for the last month of bionic, and *possibly* longer but I
  only recently caught that the Chaoskey was related.

  $ lsb_release -rd
  Description:    Ubuntu Bionic Beaver (development branch)
  Release:        18.04

  $ uname -a
  Linux workbench 4.15.0-13-generic #14-Ubuntu SMP Sat Mar 17 13:44:27 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

  $ dpkg --status linux-image-4.15.0-13-generic
  Package: linux-image-4.15.0-13-generic
  Status: install ok installed
  Priority: optional
  Section: kernel
  Installed-Size: 72167
  Maintainer: Ubuntu Kernel Team <kernel-t...@lists.ubuntu.com>
  Architecture: amd64
  Source: linux
  Version: 4.15.0-13.14
  Provides: aufs-dkms, fuse-module, ivtv-modules, kvm-api-4, linux-image, 
redhat-cluster-modules, spl-dkms, spl-modules, virtualbox-guest-modules, 
zfs-dkms, zfs-modules
  Depends: kmod
  Recommends: grub-pc | grub-efi-amd64 | grub-efi-ia32 | grub | lilo, 
initramfs-tools | linux-initramfs-tool
  Suggests: fdutils, linux-doc-4.15.0 | linux-source-4.15.0, linux-tools, 
  Description: Linux kernel image for version 4.15.0 on 64 bit x86 SMP
   This package contains the Linux kernel image for version 4.15.0 on
   64 bit x86 SMP.
   Also includes the corresponding System.map file, the modules built by the
   packager, and scripts that try to ensure that the system is not left in an
   unbootable state after an update.
   Supports Generic processors.
   Geared toward desktop and server systems.
   You likely do not want to install this package directly. Instead, install
   the linux-generic meta-package, which will ensure that upgrades work
   correctly, and that supporting packages are also installed.

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