Touchpad not working on Lenovo Flex-5 Ryzen

[Edwin Hendriks]

Model = IdeaPad Flex 5 14ARE05
Model Name = 81X2
MO: R9N0B112200U

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.11.0-38-generic 5.11.0-38.42~20.04.1
ProcVersionSignature: Ubuntu 5.11.0-38.42~20.04.1-generic 5.11.22
Uname: Linux 5.11.0-38-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 4 16:36:18 2021
InstallationDate: Installed on 2021-10-29 (6 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
SourcePackage: linux-signed-hwe-5.11
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[dim6003 (dm-martin)]

Lenovo T580 here. kernel updated yesterday, and touchpad fails since.
Some additionnal info :
didier@T580:~$ uname -a
Linux T580 5.4.0-89-generic #100-Ubuntu SMP Fri Sep 24 14:50:10 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
didier@T580:~$ cat /proc/version_signature
Ubuntu 5.4.0-89.100-generic 5.4.143

[dim6003 (dm-martin)]

See also attachments dim6003_lspci-vvnn.log and dim6003_dmesg.log