Public bug reported:
Hello Ubuntu team,
I am using Ubuntu 24.04.3 LTS (x86_64) on my machine with a T20
keyboard. The keyboard backlight is not working at all in Ubuntu.
However, it works normally in Windows on the same machine, so the
hardware is fine.
Expected behavior:
- Pressing the backlight toggle key (or Fn + backlight key) should turn on/off
or adjust brightness.
- The backlight should remain on as long as the system is running.
Actual behavior:
- The backlight does not turn on at all in Ubuntu.
- The keys have no visible lighting.
Steps to reproduce:
1. Boot into Ubuntu 24.04.3 LTS.
2. Press the keyboard backlight key (or Fn combination).
3. Observe that nothing happens.
4. Boot into Windows to confirm the backlight works.
Additional info:
- Keyboard model: T20
- Ubuntu version: 24.04.3 LTS (x86_64)
- Kernel version: (check with `uname -r` and include here)
- BIOS/firmware version: (if known)
Logs/attachments: (optional, attach dmesg output or screenshots if you
have)
Please let me know if you need more information or logs. I am happy to
help test any fixes.
Thank you.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.14.0-36-generic 6.14.0-36.36~24.04.1
ProcVersionSignature: Ubuntu 6.14.0-36.36~24.04.1-generic 6.14.11
Uname: Linux 6.14.0-36-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: tanvir 3350 F.... wireplumber
/dev/snd/controlC0: tanvir 3350 F.... wireplumber
/dev/snd/seq: tanvir 3345 F.... pipewire
CRDA: N/A
CasperMD5CheckResult: unknown
CurrentDesktop: GNOME-Classic:GNOME
Date: Sat Nov 22 14:10:41 2025
InstallationDate: Installed on 2025-10-30 (23 days ago)
InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64
(20250805.1)
IwConfig:
lo no wireless extensions.
enp4s0 no wireless extensions.
docker0 no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. B450M DS3H V2
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-6.14.0-36-generic
root=UUID=846a7e08-b8a5-4a3d-9284-e52ebdc9f7fb ro
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions:
linux-restricted-modules-6.14.0-36-generic N/A
linux-backports-modules-6.14.0-36-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.21
RfKill:
SourcePackage: linux-hwe-6.14
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/28/2025
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: F67
dmi.board.asset.tag: Default string
dmi.board.name: B450M DS3H V2
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrF67:bd10/28/2025:br5.17:svnGigabyteTechnologyCo.,Ltd.:pnB450MDS3HV2:pvrDefaultstring-CF:rvnGigabyteTechnologyCo.,Ltd.:rnB450MDS3HV2:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:
dmi.product.family: B450 MB
dmi.product.name: B450M DS3H V2
dmi.product.sku: Default string
dmi.product.version: Default string-CF
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2132179
Title:
Keyboard backlight not working on T20 keyboard in Ubuntu 24.04.3 LTS
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