laptop backlight

T

tOsYZYny

I tried to adjust the backlight of my laptop both via function keys and xbacklight -set <PERCENTAGE>, but both fail to do anything.

Upon further inspection, I see an error in dmesg regarding missing firmware. How to proceed:

ACPI Error: Aborting method \134_SB.PCI0.PEG0.PEGP.BRT6 due to previous error (AE_NOT_FOUND) (20221020/psparse-689)
ACPI Error: Aborting method \134EV5 due to previous error (AE_NOT_FOUND) (20221020/psparse-689)
Click to expand...

For reference, I have a custom kernel, but it does have acpi support.
 
Hmm, so now I'm confused, I don't know what to put in my devd conf, nor where to get those values. I tried the most basic change from the example in the link above:

notify 20 {
match "system" "ACPI";
match "subsystem" "DELL";
match "notify" "0x10";
action "/usr/bin/backlight incr 10";
};

notify 20 {
match "system" "ACPI";
match "subsystem" "DELL";
match "notify" "0x11";
action "/usr/bin/backlight decr 10";
};
Click to expand...

When hitting "function" "up" or "function" "down", still nothing happens. That is the issue I'm trying to solve now.

I ran acpidump -dt, but eh, that doesn't make any sense to me, I don't see anything that seems to match.
 
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