Public bug reported:
ASUS Zenbook UX425QA/UM425QA, Ubuntu 24.04.5 LTS, AMD Cezanne Radeon
Vega graphics.
Display brightness works correctly on kernel 6.14.0-37-generic, but not
on kernel 7.0.0-34-generic or 7.0.0-38-generic.
GNOME brightness slider and keyboard shortcuts respond, but physical
brightness does not change.
Native AMD backlight reports actual_brightness=65536 with
max_brightness=65535.
Direct sysfs brightness adjustments fail.
Tested clean kernel parameters, amdgpu.dcdebugmask=0x40000, and
acpi_backlight=video without success.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-7.0.0-38-generic 7.0.0-38.38~24.04.4
ProcVersionSignature: Ubuntu 7.0.0-38.38~24.04.4-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 20 15:54:06 2026
InstallationDate: Installed on 2025-02-03 (624 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827.1)
MachineType: ASUSTeK COMPUTER INC. ZenBook UX425QA_UM425QA
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic
root=UUID=d8e5b23a-d9e6-4d17-8348-dd31869f324e ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-7.0.0-38-generic N/A
linux-backports-modules-7.0.0-38-generic N/A
linux-firmware 20240318.git3b128b60.0ubuntu3.1
SourcePackage: linux-hwe-7.0
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/31/2021
dmi.bios.release: 5.19
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: UX425QA.301
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX425QA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.ec.firmware.release: 3.1
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrUX425QA.301:bd12/31/2021:br5.19:efr3.1:svnASUSTeKCOMPUTERINC.:pnZenBookUX425QA_UM425QA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX425QA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaZenBook:
dmi.product.family: ZenBook
dmi.product.name: ZenBook UX425QA_UM425QA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
** Affects: linux-hwe-7.0 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2171554
Title:
Brightness controls disabled/doesnt work
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