Public bug reported:
Thinkpad T14 AMD uses relatively new AMD Ryzen 4000 platform.
Screen brightness is fixed at likely the brightest setting and can not be
adjusted.
Keyboard shortcut keys are working as the brightness icon shows up, but the
actual brightness doesn't change.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: evince 3.36.7-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 15 22:13:07 2020
InstallationDate: Installed on 2020-09-16 (0 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: evince
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1895782
Title:
Screen brightness adjustment doesn't work on Lenovo Thinkpad T14 AMD
gen1
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