Brightness control is missing on HP Pavilion Gaming Laptop 15-dk0xxx

[Anatoli Navahrodski]

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

[Alex Hung (alexhung)]

There is "nomodeset" in kernel parameter (in dmesg). Did you try to remove it?

[Anatoli Navahrodski (anatolii1309)]

Not. How to do it?
I think this is a problem when I select the driver "Using X.org server"
There are also no other screen extensions.

[Alex Hung (alexhung)]

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

[Alex Hung (alexhung)]

It is also possible that you are running recovery mode which basically skips many drivers, including VGA drivers.

You may want to install proprietary Nvidia GPU Drivers (example: https://www.cyberciti.biz/faq/ubuntu-linux-install-nvidia-driver-latest-proprietary-driver/) and reboot.

I noticed you upgraded your Ubuntu from 20.10 to 21.04. Will you be able to run native 21.04 (ex. running from usb live) and check whether you can have brightness control without recovery mode?

[Anatoli Navahrodski (anatolii1309)]

As soon as I set a new Ubuntu everything works. But as soon as I reboot the PC, again the black screen.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Anatoli Navahrodski (anatolii1309)]

This has not been fixed. This is a mistake for many users.

[Kai-Heng Feng (kaihengfeng)]

Does cold boot (i.e. power off then power on) help?