Dell XPS 15 screen brightness control issue

[MF]

Brightness works, but only in one way. It can set bright but never read it back from hardware! So it's possible that the indicator shows 100% but in reality brightness is low. I have to move slider a little bit to adjust. The second issue cant just use Fn/brightness buttons. 'xev' cant catch those also only those two buttons. Probably need some backporting from new kernel?

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: powerdevil 4:5.24.4-0ubuntu1
ProcVersionSignature: Ubuntu 5.15.0-40.43-generic 5.15.35
Uname: Linux 5.15.0-40-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sun Jun 26 20:08:39 2022
InstallationDate: Installed on 2020-06-25 (731 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: powerdevil
UpgradeStatus: Upgraded to jammy on 2022-06-11 (15 days ago)

[Scarlett Gately Moore (scarlettmoore)]

This bug is very old, if it is still an issue please update the bug with info from a supported release.