Public bug reported:
Include:
HP Spectre X360 Converaible
Product# W2Q33AV
BIOS F.55
Intel HD Graphics 520 (8086:1916).
Ubuntu Cinnamon 26.04.1.
Kernel versions 7.0.0-30 and 7.0.0-31.
/sys/class/backlight/intel_backlight exists.
brightnessctl changes 234/937 to 796/937.
The hardware panel’s brightness does not change.
nomodeset removal successfully enabled i915 but did not restore
functional backlight control.
I worked this situation using Perplexity and ended up here.
The keyboard does change the OSD value but the brightness doesn't change.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-31-generic 7.0.0-31.31
ProcVersionSignature: Ubuntu 7.0.0-31.31-generic 7.0.14
Uname: Linux 7.0.0-31-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: max 2042 F.... wireplumber
/dev/snd/seq: max 2038 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: X-Cinnamon
Date: Sun Sep 13 13:52:54 2026
InstallationDate: Installed on 2026-04-25 (141 days ago)
InstallationMedia: Ubuntu-Cinnamon 24.04.4 LTS "Noble Numbat" - Release amd64
(20260210)
MachineType: HP HP Spectre x360 Convertible
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-31-generic
root=UUID=048998cb-c0da-42a1-acfa-55e74d7e24c9 ro quiet splash
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/29/2020
dmi.bios.release: 15.55
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F.55
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 81A1
dmi.board.vendor: HP
dmi.board.version: 33.79
dmi.chassis.type: 31
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 33.79
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrF.55:bd06/29/2020:br15.55:efr33.79:svnHP:pnHPSpectrex360Convertible:pvr:rvnHP:rn81A1:rvr33.79:cvnHP:ct31:cvrChassisVersion:skuW2Q33AV:pfa103C_5335KVG=NL=CONB=HPS=SPT:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=SPT
dmi.product.name: HP Spectre x360 Convertible
dmi.product.sku: W2Q33AV
dmi.sys.vendor: HP
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2167197
Title:
Cannot control screen brightness
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