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backlit keyboard not working LXQt on Debian 11 (SOLVED)

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gychang
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backlit keyboard not working LXQt on Debian 11 (SOLVED)

#1 Post by gychang »

Debian installed on Sony Vaio, it has backlit keyboard but does not light up on boot and pressing of keys. I am running LXQt and under Shortcut Keys, there is no menu to control the brightness. Would appreciate help in how to get the function back and configure to adjust with keyboard shortcut.
Last edited by gychang on 2021-11-24 19:02, edited 1 time in total.

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4D696B65
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Re: backlit keyboard not working LXQt on Debian 11

#2 Post by 4D696B65 »

Some have had luck with

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xset led 3

gychang
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Re: backlit keyboard not working LXQt on Debian 11

#3 Post by gychang »

"xset led 3" in terminal doesn't work for me.
When I change the value from -1 to 1 in the /sys/devices/platform/sony-laptop/kbd_backlight, the keyboard lights up but on reboot it loses the setting (Following the thread written for ubuntu https://askubuntu.com/questions/1030780 ... -backlight ) On debian rc.local doesn't work... Do I need a script of some sort?

mm3100
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Re: backlit keyboard not working LXQt on Debian 11

#4 Post by mm3100 »

You can make systemd service to do it on every boot. You can see more here how
https://www.redhat.com/sysadmin/replaci ... al-systemd

gychang
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Re: backlit keyboard not working LXQt on Debian 11

#5 Post by gychang »

thanks mm3100, got it working per your site suggestion.

alien-x
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Re: backlit keyboard not working LXQt on Debian 11 (SOLVED)

#6 Post by alien-x »

I had similar problems, further more my installation on HP ZBook Fury 15 G8 was missing folders like

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/sys/class/leds/hp::kbd_backlight
(and others related with backlid), none of advices I found on forums helped (

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xset led on
,

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xset led 3
, etc.). No workaround I found worked, but it was really weird for me since pressing key shortcut let the keyboard backlight turn on for ~1 sec but then it always turned off.

It the end I wanted to give it up but I tried one last shot into the dark (to turn the light on :D) - in BIOS i turned off "keyboard backlight delay" (or something like it - it was set to 30 sec, so I set it to "never") and also unchecked option "automatic backlight control". Then it started working like a charm ;)

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