[Bug 1813663] Re: External monitors does not work anymore 4.15.0-44

Hi. It seems not only Dell laptops have been affected.

I'm using Lenovo ThinkPad X280 with Lenovo USB-C dock and this bug
affects me. But the steps I reproduce the bug is different.

For the reproduce steps on Lenovo ThinkPad X280, please
refer to bug #1813763 (marked duplicated)
^
Thanks.

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https://bugs.launchpad.net/bugs/1813663

Title:
External monitors does not work anymore 4.15.0-44

Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Fix Released

Bug description:
I am using a docking station for my laptop. After install the
4.15.0-44 update my external monitors goes undetected after logging in
or having the laptop closed.

I am on 18.04.1 LTS with Intel® HD Graphics 620 (Kaby Lake GT2)
Graphics.

Going back to the 4.15.0-43 version makes it all work fine again.
---
ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: jonas 2407 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
HibernationDevice: RESUME=UUID=80397b76-2ded-4f7d-adbf-dfdface8e2d4
InstallationDate: Installed on 2018-10-17 (103 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: LENOVO 20HF004MMX
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-44-generic root=UUID=64cf1582-d574-4e2f-a40a-7942c40caf5d ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 4.15.0-44.47-generic 4.15.18
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
Tags: bionic
Uname: Linux 4.15.0-44-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip docker kvm lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 09/14/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: N1WET51W (1.30 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HF004MMX
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1WET51W(1.30):bd09/14/2018:svnLENOVO:pn20HF004MMX:pvrThinkPadT470s:rvnLENOVO:rn20HF004MMX:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T470s
dmi.product.name: 20HF004MMX
dmi.product.version: ThinkPad T470s
dmi.sys.vendor: LENOVO

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