Running kernel 5.8 and have this issue. I'm currently using xrandr (I have bash scripts if wanted) mapped to the brightness keys to adjust the brightness using software but this causes issues with other display software (such as f.lux). I am desperately looking for a fix for this.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1881462 Title: Brightness settings don't work on Lenovo Ideapad 5 15ARE05 Status in linux package in Ubuntu: Confirmed Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1881462/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
