Did you try to remove the kernel parameter "acpi_osi=linux"? Please run "ls /sys/class/backlight/" to see what backlight interfaces are available.
-- 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/1894392 Title: brightness slider working but not the brightness in ubuntu 20.04 Status in linux package in Ubuntu: Confirmed Bug description: brightness control not working ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-46-generic 5.4.0-46.50 ProcVersionSignature: Ubuntu 5.4.0-46.50-generic 5.4.60 Uname: Linux 5.4.0-46-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.9 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: sakthee 4780 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sun Sep 6 01:01:49 2020 HibernationDevice: RESUME=UUID=5441a3ef-63d8-4455-b227-f27cec9e699f InstallationDate: Installed on 2020-06-12 (85 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) MachineType: Hewlett-Packard HP 241 G1 ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-46-generic root=/dev/sda2 ro quiet nomodeset acpi_osi=linux RelatedPackageVersions: linux-restricted-modules-5.4.0-46-generic N/A linux-backports-modules-5.4.0-46-generic N/A linux-firmware 1.187.3 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/27/2015 dmi.bios.vendor: Insyde dmi.bios.version: F.31 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: 8072 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 70.07 dmi.chassis.asset.tag: 5CG5380YZX dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnInsyde:bvrF.31:bd04/27/2015:svnHewlett-Packard:pnHP241G1:pvr0988100000400010060370081:rvnHewlett-Packard:rn8072:rvrKBCVersion70.07:cvnHewlett-Packard:ct10:cvrChassisVersion: dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PRE X=MIN dmi.product.name: HP 241 G1 dmi.product.sku: P4C96PC#ACJ dmi.product.version: 0988100000400010060370081 dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1894392/+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
