Public bug reported:
My Ubuntu 20.04 has a brightness adjustment slider, but it doesn't work.
The keyboard shortcuts for adjusting brightness are also ineffective.
Additionally, there is only an 'ideapad' folder under the
/sys/class/backlight directory.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.15.0-131-generic 5.15.0-131.141~20.04.1
ProcVersionSignature: Ubuntu 5.15.0-131.141~20.04.1-generic 5.15.168
Uname: Linux 5.15.0-131-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Feb 27 21:11:36 2025
InstallationDate: Installed on 2025-02-19 (8 days ago)
InstallationMedia: Ubuntu 20.04.6 LTS "Focal Fossa" - Release amd64 (20230316)
SourcePackage: linux-signed-hwe-5.15
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-hwe-5.15 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/2100491
Title:
My Lenovo Y9000P cannot adjust the screen brightness after installing
Ubuntu 20.04.
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