It can be done by modifying the file "/etc/default/grub" Please refer to https://askubuntu.com/questions/19486/how-do-i-add-a -kernel-boot-parameter
-- 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/1934464 Title: Brightness control is missing on HP Pavilion Gaming Laptop 15-dk0xxx Status in linux package in Ubuntu: New Bug description: No brightness settings. Also black screen for login if I choose not recovery mode for login. ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: linux-image-5.11.0-22-generic 5.11.0-22.23 ProcVersionSignature: Ubuntu 5.11.0-22.23-generic 5.11.21 Uname: Linux 5.11.0-22-generic x86_64 ApportVersion: 2.20.11-0ubuntu65.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ter 3433 F.... pulseaudio /dev/snd/controlC1: ter 3433 F.... pulseaudio CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Fri Jul 2 10:33:31 2021 InstallationDate: Installed on 2021-06-25 (6 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022) MachineType: HP HP Pavilion Gaming Laptop 15-dk0xxx ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-22-generic root=UUID=a7c41e63-e7ea-43e0-9de0-55322f489ee5 ro recovery nomodeset dis_ucode_ldr RelatedPackageVersions: linux-restricted-modules-5.11.0-22-generic N/A linux-backports-modules-5.11.0-22-generic N/A linux-firmware 1.197.1 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/16/2020 dmi.bios.release: 15.33 dmi.bios.vendor: Insyde dmi.bios.version: F.33 dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: 85FB dmi.board.vendor: HP dmi.board.version: 42.42 dmi.chassis.asset.tag: Chassis Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.chassis.version: Chassis Version dmi.ec.firmware.release: 42.42 dmi.modalias: dmi:bvnInsyde:bvrF.33:bd07/16/2020:br15.33:efr42.42:svnHP:pnHPPavilionGamingLaptop15-dk0xxx:pvrType1ProductConfigId:rvnHP:rn85FB:rvr42.42:cvnHP:ct10:cvrChassisVersion: dmi.product.family: 103C_5335KV HP Pavilion dmi.product.name: HP Pavilion Gaming Laptop 15-dk0xxx dmi.product.sku: 2C7M8EA#ACB dmi.product.version: Type1ProductConfigId dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1934464/+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
