Back-light keyboard's lights are not working after upgrading to Ubuntu 22.04

Question

My backlight keyboard was working fine. I used to just use xset led on and the keyboard would just turn on its lights; however, after upgrading to 22.04. xset led on does not work anymore. I would be thankful if anyone could help me.

that's because Ubuntu defaults to Wayland since 21.04, and xset is, as it sounds, an Xorg program. You can switch to Xorg, and then it will work properly. — Esther, May 30 '22 at 21:42
You can stay with Wayland https://askubuntu.com/questions/967373/wayland-equivalent-to-xset-led — rob, Sep 06 '22 at 08:22

score 0 · Answer 1 · edited Sep 24 '22 at 06:32

0

This Steps works for me

echo 1 | sudo tee /sys/class/leds/input12\:\:scrolllock/
brightnessctl -l
brightnessctl --device='yourdevice::kbd_backlight' info
sudo brightnessctl --device='yourdevice::kbd_backlight' set 2

edited Sep 24 '22 at 06:32

Tejas Lotlikar

2,945
5
17
26

answered Sep 23 '22 at 19:04

Ram Gopal Dubey

1

Gaurav Baman · Answer 2 · 2024-02-09T11:11:20.110

In order to turn on external keyboard baklight on ubuntu 22.04, follow the steps:-

Method to switch from Wayland to X ** this step is compulsory ** Edit the configuration file,

sudo nano /etc/gdm3/custom.conf

to uncomment [remove # from] the line containing

WaylandEnable=false

save the file (ctrl + x and after that y ('yes') or another key for non-English and finally Enter) and reboot.

Method One

open a terminal
sudo xmodmap -e 'add mod3 = Scroll_Lock'
enter your password
press the scroll lock key to see if your back light comes on

Method Two

open a terminal
xset led on

score 0 · Answer 3 · answered Dec 10 '23 at 07:32

0

It works for me.

sudo xmodmap -e "add mod3 = Scroll_Lock"

answered Dec 10 '23 at 07:32

Najathi

101
2

score -1 · Answer 4 · edited Oct 02 '23 at 02:29

I had the same problem (after ubuntu update) and eventually reverted to previous ubuntu to fix it.

For future reference, this log may be helpful if anyone runs into the same issue:

From var/log/boot.log:

[FAILED] Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0.
See 'systemctl status systemd-backlight@backlight:acpi_video0.service' for details.
running systemctl gives:
systemctl status systemd-backlight@backlight:acpi_video0.service
● systemd-backlight@backlight:acpi_video0.service - Load/Save Screen Backlight Brightness of backlight:acpi_video0
     Loaded: loaded (/lib/systemd/system/systemd-backlight@.service; static; vendor preset: enabled)
     Active: failed (Result: exit-code) since Mon 2022-05-30 10:22:21 PDT; 1h 44min ago
       Docs: man:systemd-backlight@.service(8)
    Process: 464 ExecStart=/lib/systemd/systemd-backlight load backlight:acpi_video0 (code=exited, status=1/FAILURE)
   Main PID: 464 (code=exited, status=1/FAILURE)

This does not provide an answer. It would be better posted as a comment. If you've found a solution (which would be great), you should add this to your answer. — RolandiXor, Oct 02 '23 at 02:30

Back-light keyboard's lights are not working after upgrading to Ubuntu 22.04

4 Answers4