I trying different fresh live USB: 20.04, 22.04, 22.10 and 23.04-beta Only 23.04-beta can't adjust brightness level of display backlight on my laptop (lenovo legion 5 17ach6h). Processor: AMD Ryzen™ 7 5800H with Radeon™ Graphics × 16 Graphics: AMD Radeon™ Graphics / AMD Radeon™ Graphics
So I posted the same bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2015255 -- 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/1944094 Title: Can't adjust screen backlight on Legion Slim 7 / Legion 5 (2021) AMD Status in linux package in Ubuntu: Confirmed Status in linux package in Arch Linux: New Bug description: The screen brightness controls don't work on the Legion Slim 7 (AMD) laptop running in hybrid/dynamic mode. The backlight control files appear in /sys/class/backlight/amdgpu_bl0, and writing to /sys/class/backlight/amdgpu_bl0/brightness changes the value in /sys/class/backlight/amdgpu_bl0/actual_brightness, but the screen brightness always remains at 100%. I have tried kernel boot parameters: acpi_backlight=vendor amdgpu.backlight=0 but neither makes any difference. I have read that users with the Legion 7 AMD and Legion 5 Pro AMD can get the backlight working with the amdgpu.backlight=0 kernel boot parameter. One difference between them and this laptop is that it has advanced optimus, meaning that it can switch the laptop display between the amdgpu and nvidia card without rebooting, if that is at all relevant. ProblemType: Bug DistroRelease: Ubuntu 21.10 Package: linux-image-5.13.0-16-generic 5.13.0-16.16 ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13 Uname: Linux 5.13.0-16-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu69 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: rocko 1978 F.... pulseaudio /dev/snd/controlC1: rocko 1978 F.... pulseaudio CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Mon Sep 20 09:20:33 2021 InstallationDate: Installed on 2021-09-15 (5 days ago) InstallationMedia: Ubuntu 21.10 "Impish Indri" - Alpha amd64 (20210910) MachineType: LENOVO 82K8 ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.13.0-16-generic root=UUID=99f436de-d37c-4b3e-adb2-612443efc197 ro rootflags=subvol=@ quiet splash amdgpu.backlight=0 vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: XDG_RUNTIME_DIR (/run/user/1001) is not owned by us (uid 0), but by uid 1001! (This could e.g. happen if you try to connect to a non-root PulseAudio as a root user, over the native protocol. Don't do that.) No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-5.13.0-16-generic N/A linux-backports-modules-5.13.0-16-generic N/A linux-firmware 1.200 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 08/02/2021 dmi.bios.release: 1.27 dmi.bios.vendor: LENOVO dmi.bios.version: HACN27WW dmi.board.asset.tag: No Asset Tag dmi.board.name: LNVNB161216 dmi.board.vendor: LENOVO dmi.board.version: SDK0J40697WIN dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Legion S7 15ACH6 dmi.ec.firmware.release: 1.27 dmi.modalias: dmi:bvnLENOVO:bvrHACN27WW:bd08/02/2021:br1.27:efr1.27:svnLENOVO:pn82K8:pvrLegionS715ACH6:skuLENOVO_MT_82K8_BU_idea_FM_LegionS715ACH6:rvnLENOVO:rnLNVNB161216:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrLegionS715ACH6: dmi.product.family: Legion S7 15ACH6 dmi.product.name: 82K8 dmi.product.sku: LENOVO_MT_82K8_BU_idea_FM_Legion S7 15ACH6 dmi.product.version: Legion S7 15ACH6 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1944094/+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
