You are not logged in.

#1 2022-04-16 09:35:03

maximushugus
Member
Registered: 2022-04-16
Posts: 7

Change keyboard backlight max_brightness

Hello everyone,
I own a Lenovo Yoga 730 (730-13ikb), and recently installed Arch Linux on it with KDE Plasma. Thanks to the wiki, the process went quite flawlessly.
Almost everything works, I made some changes to the libfprint driver to make the fingerprint reader work.
For the battery, I'm able to activate et disable the "conservative mode" from ACPI.

However there's one thing that works but not at 100% : keyboard backlight control.
From the UI or from CLI I can disable or activate the backlight. But in reality this laptop has a 2 stages backlight (OFF, LEVEL1, LEVEL2). I can switch between all 3 modes with "Fn+Space". But in software I can only access the OFF and 1.
In "/sys/class/leds/platform::kbd_backlight" I have the "brightness" file with a value of 0 or 1 (to enable or go to LEVEL1), but I cannot put the value 2 in this file because the "max_brightness" file contains the 1 value, wich cannot be changed (I tried as root, and changing chmod).

As far as I understand, this "max_brightness" value is controled by the driver.
Does someone know I could ajust this value ?

Thanks a lot

Offline

Board footer

Powered by FluxBB