"Dim screen" setting still operates when turned off

[Robin Sheat]

I have "dim screen" set to off in my power settings, because it's mildly annoying when I'm on power, which is most of the time. Despite this, the screen will still dim after 30 seconds of inactivity.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome-power-manager 3.32.0-2build2
ProcVersionSignature: Ubuntu 5.15.0-30.31-generic 5.15.30
Uname: Linux 5.15.0-30-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue May 31 11:23:59 2022
InstallationDate: Installed on 2022-03-17 (74 days ago)
InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220313)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: gnome-power-manager
UpgradeStatus: No upgrade log present (probably fresh install)