[Bug 1881461] [NEW] Brightness settings don't work on Lenovo Ideapad 5 15ARE05

[Launchpad Bug Tracker]

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After installation, the notebook brighness buttons change brightness
settings, but settings are not applied on the screen.

Failed to start Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0.
amdgpu_bl0: Failed to write system 'brightness' attribute: No such device or address
amdgpu_bl0: Failed to write system 'brightness' attribute: No such device or address
Failed to get backlight or LED device 'backlight:acpi_video0': No such device

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Uname: Linux 5.4.0-33-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: X-Cinnamon
Date: Sun May 31 09:04:49 2020
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
InstallationDate: Installed on 2020-05-29 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
Symptom: installation
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal ubiquity-20.04.15
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Brightness settings don't work on Lenovo Ideapad 5 15ARE05
https://bugs.launchpad.net/bugs/1881461
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