kworker takes around 25% cpu usage permanently

[Alexandre Saindelle]

The problem appeared when I upgraded my linux kernel from 6.2.0-26-generic to 6.2.0-36-generic.
Observing the output of the top command, the processes that show up at the top are :
- kworker/0:x+kacpid
- kworker/0:x-kacpi_notify

where x changing from 0 to 3.
CPU usage of those tasks varies between 20% and 25%.

List of packages related to the new kernel (from grep " install " /var/log/dpkg.log)
linux-modules-6.2.0-36-generic:amd64 <none> 6.2.0-36.37~22.04.1
inux-image-6.2.0-36-generic:amd64 <none> 6.2.0-36.37~22.04.1
linux-modules-extra-6.2.0-36-generic:amd64 <none> 6.2.0-36.37~22.04.1
linux-hwe-6.2-headers-6.2.0-36:all <none> 6.2.0-36.37~22.04.1
inux-headers-6.2.0-36-generic:amd64 <none> 6.2.0-36.37~22.04.1

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-6.2.0-36-generic 6.2.0-36.37~22.04.1
ProcVersionSignature: Ubuntu 6.2.0-36.37~22.04.1-generic 6.2.16
Uname: Linux 6.2.0-36-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Sun Nov 19 23:22:28 2023
InstallationDate: Installed on 2023-11-19 (0 days ago)
InstallationMedia: Ubuntu-MATE 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.1)
SourcePackage: linux-signed-hwe-6.2
UpgradeStatus: No upgrade log present (probably fresh install)