[Bug 1813917] Re: Unable to use docking station on linux-image-4.15.0-44-generic

** Attachment added: "dmesg log on linux-image-4.15.0-44-generic after failing"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813917/+attachment/5234200/+files/dmesg_linux-image-4.15.0-44-generic.log

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https://bugs.launchpad.net/bugs/1813917

Title:
Unable to use docking station on linux-image-4.15.0-44-generic

Status in linux package in Ubuntu:
Confirmed

Bug description:
I have a Lenovo T580 for work.
It has a Intel® Core™ i7-8550U CPU, and runs integrated graphics.

When booting linux-image-4.15.0-44-generic kernel, and the machine is docked in the docking station, I can get as far as login. But after entering my password something goes wrong, and screen output is lost completely.
Also, logging on it through SSH and shutting it down, you can wait for ages, I have yet to see it actually turn off.

Booting linux-image-4.15.0-43-generic there are no issues.

I have a colleague who has a similar machine, but with nVidia graphics
card and Pop!_OS booting in legacy mode. He does not have this issue
with linux-image-4.15.0-44-generic.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-44-generic 4.15.0-44.47
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: jk 3387 F.... pulseaudio
/dev/snd/controlC0: jk 3387 F.... pulseaudio
/dev/snd/controlC1: jk 3387 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Wed Jan 30 11:54:12 2019
HibernationDevice: RESUME=UUID=7c76546e-c678-42c7-8cc2-d46d1228cb45
InstallationDate: Installed on 2018-09-24 (128 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: LENOVO 20L9CTO1WW
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=da_DK.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-43-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-4.15.0-43-generic N/A
linux-backports-modules-4.15.0-43-generic N/A
linux-firmware 1.173.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/08/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N27ET32W (1.18 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20L9CTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0R32862 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN27ET32W(1.18):bd11/08/2018:svnLENOVO:pn20L9CTO1WW:pvrThinkPadT580:rvnLENOVO:rn20L9CTO1WW:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T580
dmi.product.name: 20L9CTO1WW
dmi.product.version: ThinkPad T580
dmi.sys.vendor: LENOVO

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