[Bug 1813818] [NEW] Plugging into dock now causes ubuntu to hang,

Public bug reported:

After upgrading to 4.15.0-44-generic plugging into a Dell TB16 dock
causes the displays to go dark, and nothing is responsive. The only way
to recover is to hard reboot the machine.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-44-generic 4.15.0-44.47
ProcVersionSignature: Ubuntu 4.15.0-44.47-generic 4.15.18
Uname: Linux 4.15.0-44-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: hoenig 2633 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 29 12:11:39 2019
HibernationDevice: RESUME=UUID=0efda07f-2d2a-4c28-958b-58a3c1f9ceb2
InstallationDate: Installed on 2018-08-13 (169 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 04f2:0976 Chicony Electronics Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Precision 5520
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-44-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.15.0-44-generic N/A
linux-backports-modules-4.15.0-44-generic N/A
linux-firmware 1.173.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/02/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.12.1
dmi.board.name: 0R6JFH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.12.1:bd10/02/2018:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn0R6JFH:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 5520
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
Importance: Undecided
Status: New


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1813818

Title:
Plugging into dock now causes ubuntu to hang,

Status in linux package in Ubuntu:
New

Bug description:
After upgrading to 4.15.0-44-generic plugging into a Dell TB16 dock
causes the displays to go dark, and nothing is responsive. The only
way to recover is to hard reboot the machine.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-44-generic 4.15.0-44.47
ProcVersionSignature: Ubuntu 4.15.0-44.47-generic 4.15.18
Uname: Linux 4.15.0-44-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: hoenig 2633 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 29 12:11:39 2019
HibernationDevice: RESUME=UUID=0efda07f-2d2a-4c28-958b-58a3c1f9ceb2
InstallationDate: Installed on 2018-08-13 (169 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 04f2:0976 Chicony Electronics Co., Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Precision 5520
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-44-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.15.0-44-generic N/A
linux-backports-modules-4.15.0-44-generic N/A
linux-firmware 1.173.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/02/2018
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.12.1
dmi.board.name: 0R6JFH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.12.1:bd10/02/2018:svnDellInc.:pnPrecision5520:pvr:rvnDellInc.:rn0R6JFH:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 5520
dmi.sys.vendor: Dell Inc.

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