HP Probook 445 g11 AMD Ryzen 7 7735U with Radeon Graphics Backlight not controllable

[Philipp Stappert]

I already tried the following grub configs:
acpi_backlight=vendor
acpi_backlight=native
acpi_backlight=amdgpu
amdgpu.backlight=0
nomodeset

lsb_release -rd:
No LSB modules are available.
Description: Ubuntu 24.04.2 LTS
Release: 24.04

I expect to be able to control the backlight. Also, waking up after hibernation, the pc seems to be working, but nothing is displayed (probably also linked to the backlight problem).

I cannot attach any files described in the wiki article as this form only allows one attachment but i will try to add them after posting this.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.11.0-26-generic 6.11.0-26.26~24.04.1
ProcVersionSignature: Ubuntu 6.11.0-26.26~24.04.1-generic 6.11.11
Uname: Linux 6.11.0-26-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu May 22 11:29:46 2025
InstallationDate: Installed on 2025-05-21 (0 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
ProcEnviron:
 LANG=de_DE.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: linux-signed-hwe-6.11
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel Letzeisen (dtl131)]

https://gitlab.freedesktop.org/drm/amd/-/issues/3701

Looks like it will be fixed in 6.15 kernel.
https://github.com/torvalds/linux/commit/f6d17270d18a6a6753fff046330483d43f8405e4
https://github.com/torvalds/linux/commit/139e99d58e373bd11f085766e681d21d34d0b097

[Hui Wang (hui.wang)]

If you install and boot with 6.8.0-generic kernel, does this issue still happen?

[Philipp Stappert (phsta)]

Yes, i did install ubuntu 22.04 lts now and it does work. I'll wait for kernel 6.15 and hope it works :)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Nils Weiher (nils.weiher)]

Hi everyone,

I found this bug via google.
I am still having this issue with HP ProBook 445 G11 as of today.

[Loai KH (loaikh)]

Same for HP ProBook 465 G11

[Nils Weiher (nils.weiher)]

When using the mainline kernel release 6.15.5 the backlight can be controlled again and is no longer stuck at 100% on HP ProBook 445 G11

https://kernel.ubuntu.com/mainline/v6.15.5/amd64/

neofetch details:

OS: Ubuntu 24.04.2 LTS x86_64
Host: HP ProBook 445 14 inch G11 Notebook PC SBKPF,SBKPFV2
Kernel: 6.15.5-061505-generic
Uptime: 2 mins
Packages: 1907 (dpkg), 13 (snap)
Shell: bash 5.2.21
Resolution: 1920x1200
DE: GNOME 46.0
WM: Mutter
WM Theme: Adwaita
Theme: Yaru [GTK2/3]
Icons: Yaru [GTK2/3]
Terminal: gnome-terminal
CPU: AMD Ryzen 5 7535U with Radeon Graphics (12) @ 4.630GHz
GPU: AMD ATI Radeon 680M
Memory: 3230MiB / 15261MiB