Public bug reported:
I'm assuming this is in gnome-system-monitor, but I don't know for sure.
The keys appear to be mapped correctly - when I bring up the keyboard
settings app from the Preferences menu and navigate: shortcuts, binding,
search by accelerator, and press the keys, it reports they are bound to
Monitor Brightness down/up, correctly. They are bound to Fn 3 and 4, for
down/up, respectively
The problem is nothing happens. When I migrated from 25.10 to 26.04, the
screen brightness jumped waaaay up and my eyes are tearing. FWIW, the
audio function keys work fine.
This is on an LG Gram laptop - I assume you have that info.
I also have an HP Envy desktop that suffers the same problem.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: gnome-system-monitor 49.1-2
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: X-Cinnamon
Date: Fri Aug 14 11:52:27 2026
InstallationDate: Installed on 2025-07-20 (390 days ago)
InstallationMedia: Ubuntu-Cinnamon 25.04 "Plucky Puffin" - Release amd64
(20250415.2)
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
SourcePackage: gnome-system-monitor
UpgradeStatus: Upgraded to resolute on 2026-08-08 (6 days ago)
** Affects: gnome-system-monitor (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2163518
Title:
screen brightness controls don't work
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