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lost backlight control

In late 2021 or 2022 there was a kernel update that broke my backlight control on my Lenovo X390 laptop w/ Artix.

I had been using the backlight_control package, binding commands from that to my backlight up/down keys. I tried fixing it, gave up and am now again trying to fix it.

I have intel graphics.

When I run:
Quote
ls /sys/class/backlight/
I get nothing, no facilities for interfacing with the backlight

when I try to use my backlight control package directly in console:
 
Quote
backlight_control -20

I get:
Quote
failed to open /sys/class/backlight/intel_backlight/brightness

When I run:
Code: [Select]
xrandr --output 0x41 --brightness 0.5

the screen momentarily darkens considerably, but goes back to full brightness after 1-2 seconds

Need guidance on how to proceed

Re: lost backlight control

Reply #1 –
there is a way to fix this to work the way it is intended. (the new way)
but you can just control the light wit old controls. it will work like before.
just installacpilight and it will replace xbacklight.

you can also make "/etc/X11/xorg.conf.d/20-intel.conf" that's the fix, but...
read the wiki