*** This bug is a duplicate of bug 1813663 ***
https://bugs.launchpad.net/bugs/1813663
I can verify that updating to 4.15.0.45.47 fixed this problem for me.
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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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