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:
__schedule+0x297/0x8b0
schedule+0x2c/0x80
schedule_timeout+0x1cf/0x350
? ttwu_do_activate+0x7a/0x90
wait_for_completion+0xba/0x140
? wake_up_q+0x80/0x80
hwrng_unregister+0x8f/0xa0
*** chaoskey_disconnect+0xbe/0x110 [chaoskey] ***
usb_unbind_interface+0x77/0x290
device_release_driver_internal+0x15b/0x220
device_release_driver+0x12/0x20
bus_remove_device+0xec/0x160
device_del+0x13d/0x360
? usb_remove_ep_devs+0x1f/0x30
usb_disable_device+0x9f/0x270
usb_disconnect+0xc6/0x270
hub_quiesce+0x48/0xa0
hub_event+0xfb/0xb10
process_one_work+0x1de/0x410
worker_thread+0x32/0x410
kthread+0x121/0x140
? process_one_work+0x410/0x410
? kthread_create_worker_on_cpu+0x70/0x70
? do_syscall_64+0x73/0x130
? SyS_exit_group+0x14/0x20
ret_from_fork+0x35/0x40
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 <email address hidden>
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, linux-headers-4.15.0-13-generic
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.
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1762816
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.