Arch Linux

word-sys

Member

Registered: 2025-03-13

Posts: 10

Keyboard Light Not Working on linux-6.13.6

On ACER NITRO 5 AN515-58, about a months ago its working and no problem with linux-6.12.10, now while 6.13.5-6.13.6 kernel on Arch Linux, keyboard light not working, closing and not opening after successful boot, no service problems, no bugs or errors on logs, just keyboard light not working, even controller of F9 Brightness down(keyboard) and F10 brightness up(keyboard) not working anymore, pressing F10 makes screen brightness to 0, after that screen brightness down button not working, only up button working.

In conclusion 1.)Keyboard light not working on Kernel 6.13.5-6.13.6 (linux and linux-zen same issue) but works on Linux 6.12.10, 2.) The first bug is a second bug that also breaks the keyboard light on/off key functions.

twelveeighty

Member

From: Alberta, Canada

Registered: 2011-09-04

Posts: 1,265

Re: Keyboard Light Not Working on linux-6.13.6

linux-lts is at 6.12.18 (for now), does it work with the LTS kernel?

word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

i need to format the laptop for checking it, i will say if its works or not when i format it

gromit

Package Maintainer (PM)

From: Germany

Registered: 2024-02-10

Posts: 1,033

Website

Re: Keyboard Light Not Working on linux-6.13.6

You don't need to format the laptop to install another kernel, just do a "pacman -S linux-lts" and teach your bootloader how to boot it.
Afterwards you can then verify that you have indeed booted the right kernel by running "uname -r"

word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

im not on Arch Linux right now because of this problem im sorry, im working on dark so keyboard light is so important for me, in conclusion i need to format laptop and reinstall as linux-lts to inform and give more data for inspection of this bug.

word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

I just formatted and installed with linux-lts, keyboard lights are working and buttons are functional, problem is on 6.13 kernel, i had same issue for 6.13.5 and 6.13.6.

twelveeighty

Member

From: Alberta, Canada

Registered: 2011-09-04

Posts: 1,265

Re: Keyboard Light Not Working on linux-6.13.6

OK - so next step to getting any closer to resolving is to investigate / provide us with details: graphics card info, startup logs on a failing system, etc. See https://bbs.archlinux.org/viewtopic.php?id=57855.

You can install linux and linux-lts together on one system and configure your bootloader to switch between them at boot.

I also recommend you use the "Report" button on your own post #1 and ask a mod to move the thread to "Newbie Corner", you might get more eyes on it. There might be others with the same hardware that know a workaround or more details.

word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

GPU: RTX 4060 Laptop GPU + Intel UHD
CPU: Intel i5-12450H
RAM: 16GB DDR5 5200MHz
KDE or GNOME doesnt matter problem starts at installation media which ends up closing keyboard light, but i had 1.1.2025 arch iso when i tried it no problem

No Failing System at startup, systems and services works fine

Last edited by word-sys (2025-03-14 19:33:38)

word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

Like i said there must be a generic issue that when its modified or removed it trigged that keyboard light function to off, unable to open again no matter what i use, i even looked to Keyboard Backligh on Arch Linux page, didnt fixed issue

WorMzy

Administrator

From: Scotland

Registered: 2010-06-16

Posts: 12,664

Website

Re: Keyboard Light Not Working on linux-6.13.6

Mod note: Moving to NC, on request.

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twelveeighty

Member

From: Alberta, Canada

Registered: 2011-09-04

Posts: 1,265

Re: Keyboard Light Not Working on linux-6.13.6

It's important to understand that we can only help if we have data to work with, as per the Post complete logs/output/versions/error messages link I sent in post #7. For starters, post your journal and/or dmesg from a boot where the problem is present. Also post the output of various commands (failing or not) that the Keyboard backlight Wiki article suggests, such as (replace ${vendor} with the proper value):

$ cat /sys/class/leds/${vendor}::kbd_backlight/max_brightness

word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

cat /sys/class/leds/${vendor}::kbd_backlight/max_brightness not found

twelveeighty

Member

From: Alberta, Canada

Registered: 2011-09-04

Posts: 1,265

Re: Keyboard Light Not Working on linux-6.13.6

Post the ACTUAL command and its output. What did you replace ${vendor} with?

For starters, post your journal and/or dmesg from a boot where the problem is present

If you want help, this is my last time asking for this.

seth

Member

Registered: 2012-09-03

Posts: 61,858

Re: Keyboard Light Not Working on linux-6.13.6

What did you replace ${vendor} with?

Nothing, I'd assume.

@word-sys, https://deepl.com/ might help you to understand what twelveeighty is saying/asking

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word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

im quiting arch linux and this problem fixed on Kernel 6.14 so dont worry

buboleck

Member

Registered: 2025-03-19

Posts: 2

Re: Keyboard Light Not Working on linux-6.13.6

I'm on Gentoo and all was good in 6.12, I just found that in kernel 6.13.7 I need to enable "CONFIG_ACPI_EC=y" for my brightness function keys to work, it is a new kernel option. (Asus M509DA)

Embedded Controller (ACPI_EC)

CONFIG_ACPI_EC:

This driver handles communication with the microcontroller
on many x86/LoongArch laptops and other machines.

word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

Where i can enable this thing?

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 24,156

Re: Keyboard Light Not Working on linux-6.13.6

In the kernel config, but it already is enabled in Arch's kernel: https://gitlab.archlinux.org/archlinux/ … onfig#L642

word-sys

Member

Registered: 2025-03-13

Posts: 10

Re: Keyboard Light Not Working on linux-6.13.6

I was on 6.13.6 and i cannot use keyboard brightness so its fixed on 6.13.7?

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 24,156

Re: Keyboard Light Not Working on linux-6.13.6

Maybe, probably not and bubolek just shared their experience which may or may not be relevant to your situation. That kernel option as is was definitely already present on 6.13.6 though. But since you apparently know that it's fixed in 6.14 you likely know a commit id that you could compare the kernel changelogs against for their presence.

Last edited by V1del (Yesterday 17:59:05)

seth

Member

Registered: 2012-09-03

Posts: 61,858

Re: Keyboard Light Not Working on linux-6.13.6

Post the ACTUAL command and its output. What did you replace ${vendor} with?

For starters, post your journal and/or dmesg from a boot where the problem is present

If you want help, this is my last time asking for this.

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