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. 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: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance.  http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.16 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1762816 Title: chaoskey interferes with suspend on thinkpad Status in linux package in Ubuntu: Incomplete 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: __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 <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, 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1762816/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp