Public bug reported:
After updating OS, I lost control of being able to change the screen
brightness. To correct, I rebooted to an earlier version of the OS. I am
using a Lenovo T450 thinkpad.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.17.0-40-generic 6.17.0-40.40~24.04.1
ProcVersionSignature: Ubuntu 6.17.0-40.40~24.04.1-generic 6.17.13
Uname: Linux 6.17.0-40-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Jul 20 16:46:33 2026
InstallationDate: Installed on 2026-02-25 (146 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: linux-signed-hwe-6.17
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-signed-hwe-6.17 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble third-party-packages wayland-session
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https://bugs.launchpad.net/bugs/2161372
Title:
after updating os, I lost control of screen brightness
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