Keyboard/touchpad unresponsive after 5.8/20.04 upgrade

Bug #1931787 reported by Owen Cameron
This bug affects 63 people
Affects Status Importance Assigned to Milestone
linux-signed-hwe-5.8 (Ubuntu)

Bug Description

I recently replaced broken screen on HP Spectre x360 G2, and upgraded to 5.8 (Ubuntu 20.04). Keyboard and touchpad became unresponsive - 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 indicator so this hack is insufficient). Evidently, it is not a hardware problem.
Works fine with external keyboard and mouse.

A similar bug from previous distro:

This issue, including my troubleshooting, is otherwise documented here:

Seems many others had similar issues with 20.04 upgrade - some with only touchpad issues. (Many now marked as duplicates)

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 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: linux-signed-hwe-5.8
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
Owen Cameron (odcameron) wrote :
Owen Cameron (odcameron)
description: updated
Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in linux-signed-hwe-5.8 (Ubuntu):
status: New → Confirmed
Owen Cameron (odcameron)
description: updated
Owen Cameron (odcameron)
summary: - Keyboard and touchpad absent after booting, but not before
+ Keyboard/touchpad unresponsive after 5.8 upgrade
summary: - Keyboard/touchpad unresponsive after 5.8 upgrade
+ Keyboard/touchpad unresponsive after 5.8/20.04 upgrade
Owen Cameron (odcameron)
description: updated
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