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


** Changed in: linux-signed-hwe-6.11 (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/2111484

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

Status in linux-signed-hwe-6.11 package in Ubuntu:
  Triaged

Bug description:
  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)

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