*** This bug is a duplicate of bug 1813663 ***
    https://bugs.launchpad.net/bugs/1813663

Looks like this is the same as bug 1813663.

** This bug has been marked a duplicate of bug 1813663
   External monitors does not work anymore 4.15.0-44

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https://bugs.launchpad.net/bugs/1813946

Title:
  linux-image-4.15.0-44-generic on Thinkpad T480s with docking station -
  unresponsive black screen

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Upon upgrading linux-image-generic and linux-header-generic from
  version 4.15.0.43.45 to version 4.15.0.44.46, my Lenovo Thinkpad T480s
  no longer works when plugged into its docking station. Symptoms seem
  similar to those described in
  https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1811860,
  but downgrading firmware has no effect.

  What I expected to happen: When plugging my laptop into the docking
  station, the touchpad, keyboard and mouse are responsive, and internal
  and external displays work.

  What happened: When plugging my laptop into the docking station, the
  touchpad, keyboard and mouse where unresponsive. External display was
  black and internal display was frozen. Unplugging the laptop did not
  have any effect. Hard reboot by holding the power button was required.

  After booting into 4.15.0-43-generic and removing linux-
  image-4.15.0-44-generic and linux-headers-4.15.0-44-generic, the
  problem disappears.

  Should anyone else wish to follow the same steps until the problem is
  resolved, make sure you do not try to remove the kernel that you are
  currently on. That is, do not run the command

  sudo apt-get remove linux-image-4.15.0-44-generic linux-
  headers-4.15.0-44-generic

  unless you booted into an older kernel.

  Addition info
  -------------

  $ lsb_release -rd
  Description:  Ubuntu 18.04.1 LTS
  Release:      18.04

  $ apt-cache policy linux-image-generic:
  linux-image-generic:
    Installed: (none)
    Candidate: 4.15.0.44.46
    Version table:
       4.15.0.44.46 500
          500 https://mirror.one.com/ubuntu bionic-security/main amd64 Packages
          500 https://mirror.one.com/ubuntu bionic-updates/main amd64 Packages
       4.15.0.20.23 500
          500 https://mirror.one.com/ubuntu bionic/main amd64 Packages

  log entry from /var/log/apt/history.log showing installation of
  packages that caused the problem:

  Start-Date: 2019-01-30  09:54:45
  Commandline: aptdaemon role='role-commit-packages' sender=':1.113'
  Install: linux-image-4.15.0-44-generic:amd64 (4.15.0-44.47, automatic), 
linux-headers-4.15.0-44:amd64 (4.15.0-44.47, automatic), 
linux-headers-4.15.0-44-generic:amd64 (4.15.0-44.47, automatic), 
linux-modules-extra-4.15.0-44-generic:amd64 (4.15.0-44.47, automatic), 
linux-modules-4.15.0-44-generic:amd64 (4.15.0-44.47, automatic)
  Upgrade: irqbalance:amd64 (1.3.0-0.1, 1.3.0-0.1ubuntu0.18.04.1), 
linux-headers-generic:amd64 (4.15.0.43.45, 4.15.0.44.46), linux-libc-dev:amd64 
(4.15.0-43.46, 4.15.0-44.47), linux-image-generic:amd64 (4.15.0.43.45, 
4.15.0.44.46), libasound2-data:amd64 (1.1.3-5ubuntu0.1, 1.1.3-5ubuntu0.2), 
linux-signed-generic:amd64 (4.15.0.43.45, 4.15.0.44.46), libasound2:amd64 
(1.1.3-5ubuntu0.1, 1.1.3-5ubuntu0.2), linux-generic:amd64 (4.15.0.43.45, 
4.15.0.44.46)
  End-Date: 2019-01-30  09:55:18

  log entry from /var/log/apt/history.log showing removal of packages
  that fixed the problem:

  Start-Date: 2019-01-30  14:54:33
  Commandline: apt-get remove linux-image-4.15.0-44-generic 
linux-headers-4.15.0-44-generic
  Requested-By: dahlbaek (1000)
  Remove: linux-image-4.15.0-44-generic:amd64 (4.15.0-44.47)
  End-Date: 2019-01-30  14:54:36

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