You have been subscribed to a public bug:
After installation, the notebook brighness buttons change brightness
settings, but settings are not applied on the screen.
In the log files I can see something like this:
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: xorg 1:7.7+19ubuntu14
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
BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: X-Cinnamon
Date: Sun May 31 10:43:17 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Advanced Micro Devices, Inc. [AMD/ATI] Renoir [1002:1636] (rev ce) (prog-if 00
[VGA controller])
Subsystem: Lenovo Renoir [17aa:381b]
InstallationDate: Installed on 2020-05-29 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 81YQ
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-33-generic
root=UUID=94ab3768-11c5-4582-9374-578128353e38 ro quiet splash
amdgpu.exp_hw_support=1 vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/25/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: E7CN24WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: No DPK
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: IdeaPad 5 15ARE05
dmi.modalias:
dmi:bvnLENOVO:bvrE7CN24WW:bd03/25/2020:svnLENOVO:pn81YQ:pvrIdeaPad515ARE05:rvnLENOVO:rnLNVNB161216:rvrNoDPK:cvnLENOVO:ct10:cvrIdeaPad515ARE05:
dmi.product.family: IdeaPad 5 15ARE05
dmi.product.name: 81YQ
dmi.product.sku: LENOVO_MT_81YQ_BU_idea_FM_IdeaPad 5 15ARE05
dmi.product.version: IdeaPad 5 15ARE05
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-2ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal ubuntu
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Brightness settings don't work on Lenovo Ideapad 5 15ARE05
https://bugs.launchpad.net/bugs/1881462
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