Public bug reported:

After recently replaced broken screen, keyboard and touchpad became
irresponsive - but only after booting. Booting with old kernel (e.g.
5.4.0-42) restored full control. Also, disabling acpi restored control
(but one wants to see battery level...). Evidently, it is not  hardwear
problem.


A similar bug from previous distro:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1894125


This issue, including my troubleshooting, is otherwise documented here: 
https://askubuntu.com/questions/1345402/is-there-a-proper-solution-to-keyboard-and-mouse-not-working-after-boot-proble

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-55-generic 5.8.0-55.62~20.04.1
ProcVersionSignature: Ubuntu 5.8.0-55.62~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-55-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Jun 13 13:15:43 2021
InstallationDate: Installed on 2021-06-07 (5 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
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/1931787

Title:
  Keyboard and touchpad absent after booting, but not before

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