Seeing this with a Lenovo T480.  Laptop display + USB-C dock with a
DisplayPort and HDMI out.  No issues with the HDMI connection, but the
DisplayPort connection is where I was having issues.  If the system
detected the Display Port monitor it came in as a disabled monitor.  If
I enabled it, then all screens would go blank and I would have to force
the laptop off to recover.  Currently booting back into 4.15.0-43
without issue.

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

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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