CPU spikes from touchpad interrupt even if deactivated

[Thomas]

Since upgrade to kernel 5.15 I have problems with irq/204-rmi4_sm which fires extreme CPU spike (10-20% shown in top) if the touchpad of my Lenovo Thinkpad Extreme is touched in any way. The touchpad is disabled in BIOS as well as in X configuration. Unfortunately I can not easily step back to prior kernel for testing since the upgrade was done in a release migration towards 22.04.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-23-lowlatency 5.15.0-23.23
ProcVersionSignature: Ubuntu 5.15.0-23.23-lowlatency 5.15.27
Uname: Linux 5.15.0-23-lowlatency x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu80
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Sun Apr 10 21:41:53 2022
InstallationDate: Installed on 2019-12-19 (843 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: linux-signed-lowlatency
UpgradeStatus: Upgraded to jammy on 2022-04-07 (3 days ago)
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2022-04-09T11:41:02.383904