Public bug reported:

I am running Ubuntu 20.04.2 LTS on my ThinkPad L15 laptop.

>From time to time the keyboard gets stuck / locked up. Sometimes it
takes days to happen, sometimes it happens within a few minutes. It also
does not seem to depend on the programs I am running, it seems to be
entirely random. Basically, I am working/playing on the laptop and then
suddenly the key I pressed last "gets stuck" and the keyboard does not
respond any more. Other than that everything is running fine and I can
still use the mouse and so on, but logging out does not resolve the
issue and only a restart seems to work. I have also tried connecting a
USB keyboard while the problem is occurring. The external keyboard is
then detected and works fine, the built-in keyboard stops sending the
signal and remains unresponsive.

I have already mentioned the problem here, but it could not be resolved: 
https://ubuntuforums.org/showthread.php?t=2460675
I have also contacted Lenovo Hardware Support, and ran their tests, but those 
did not return anything, so they said it was not a hardware issue. 

My best guess is that it is a bug in the driver for the AT Translated
Set 2 keyboard (I have the German keyboard layout), which is listed as
supported hardware. Current and latest driver version is 1.0.1

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-53-generic 5.8.0-53.60~20.04.1
ProcVersionSignature: Ubuntu 5.8.0-53.60~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-53-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Jun  3 13:45:29 2021
InstallationDate: Installed on 2020-12-29 (156 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
SourcePackage: linux-signed-hwe-5.8
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-signed-hwe-5.8 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1930745

Title:
  AT Translated Set 2 keyboard locks up seemingly randomly, infinitely
  repeating last pressed key

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