Public bug reported:
The screen brightness cannot be changed. It is always at maximum.
Strangely enough, it happened once or twice (seemingly randomly) that I was
able to change it, but after a reboot the brightness was again stuck in max.
My machine is a Lenovo T14s ThinkPad with AMD Ryzen 5 PRO 4650U with Radeon
Graphics.
I installed the drivers I found in the AMD site
('amdgpu-pro-18.40-697810-ubuntu-18.04' and
'amdgpu-pro-20.40-1147287-ubuntu-18.04'), but the issue remains (although it
fixed the issue of not recognizing external monitor).
I tried Ubuntu 20.04, but I get the same behavior.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-5.4.0-52-generic 5.4.0-52.57~18.04.1
ProcVersionSignature: Ubuntu 5.4.0-52.57~18.04.1-generic 5.4.65
Uname: Linux 5.4.0-52-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 29 11:35:16 2020
InstallationDate: Installed on 2020-10-22 (6 days ago)
InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64
(20200806.1)
SourcePackage: linux-signed-hwe-5.4
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-hwe-5.4 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1902035
Title:
Screen brightness cannot be changed in Lenovo T14s with AMD Ryzen 5
PRO 4650U with Radeon Graphics
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