Public bug reported:
Lenovo ThinkPad T450s
Intel HD Graphics 5500 [8086:1616], i915
Brightness does not work with:
7.0.0-28-generic
both for the slider in the top right and the dedicated brightness keys.
Brightness works with:
6.17.0-29-generic
/sys/class/backlight/intel_backlight exists.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-7.0.0-28-generic 7.0.0-28.28~24.04.1
ProcVersionSignature: Ubuntu 7.0.0-28.28~24.04.1-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.28.2-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: peter 2437 F.... wireplumber
/dev/snd/controlC0: peter 2437 F.... wireplumber
/dev/snd/seq: peter 2433 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Aug 2 22:25:21 2026
InstallationDate: Installed on 2026-02-03 (180 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
MachineType: LENOVO 20BWS0RK0H
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-7.0.0-28-generic
root=UUID=3d7856b5-02f4-476e-81b4-bab4e4f6797d ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-7.0.0-28-generic N/A
linux-backports-modules-7.0.0-28-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.27
SourcePackage: linux-hwe-7.0
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/14/2019
dmi.bios.release: 1.37
dmi.bios.vendor: LENOVO
dmi.bios.version: JBET73WW (1.37 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BWS0RK0H
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.4
dmi.modalias:
dmi:bvnLENOVO:bvrJBET73WW(1.37):bd08/14/2019:br1.37:efr1.4:svnLENOVO:pn20BWS0RK0H:pvrThinkPadT450s:rvnLENOVO:rn20BWS0RK0H:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20BW_BU_Think_FM_ThinkPadT450s:pfaThinkPadT450s:
dmi.product.family: ThinkPad T450s
dmi.product.name: 20BWS0RK0H
dmi.product.sku: LENOVO_MT_20BW_BU_Think_FM_ThinkPad T450s
dmi.product.version: ThinkPad T450s
dmi.sys.vendor: LENOVO
** 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/2162683
Title:
Display brightness control does not work with kernel 7.0.0-28-generic.
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