Powerdevil settings not working

Settings in Powerdevil does not seem to work.

I have these settings:
* AC: dim screen after 5 minutes, sleep when closing lid.
* Battery: dim after 5 mins, switch off after 10, sleep after 15, sleep on close.
* Low battery: dim after 1, switch off after 2, sleep after 5, sleep on close.

This is what happens:
* AC: dim at ca 3:45, switch off (black screen) at 5
* Battery: dim at ca 2:30, dim more at 3:45, switch off at 5

Obviously some other setting overrides the seetings of Powerdevil.

I am on (K)Ubuntu Studio 20.04 with Plasma 5.18.5. Hardware HP zBook 15 G3

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: powerdevil 4:5.18.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-81.91-lowlatency 5.4.128
Uname: Linux 5.4.0-81-lowlatency x86_64
ApportVersion: 2.20.11-0ubuntu27.18
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Tue Sep 7 11:01:44 2021
InstallationDate: Installed on 2021-02-07 (211 days ago)
InstallationMedia: Kubuntu 20.04.2 LTS "Focal Fossa" - Release amd64 (20210204)
SourcePackage: powerdevil
UpgradeStatus: No upgrade log present (probably fresh install)