notebook display brightness

[Ivan B. Serezhkin]

Good day.

I bought samsung r70, all the data that I have obtained on the equipment 
can be taken from here: http://ivan.serezhkin.com/r70/
After patching DSDT, it compiles well (only one warinig about nvidia 
graphics card).
I found a strange problem that I do not want to solve: Fn button-<Lover 
bright> and Fn - <Raise bright> only works on the console and  not 
working under xorg.

I decide to write wmdockapp that can show and changing the brightness of 
the display, but I do not understand how evoke acpi method to obtain 
info about brightness and change it.
Also, I am interested in obtaining closing notebook event to execute 
some scripts.

Please explain to me where can I find the documentation about 
programming acpi in userland in FreeBSD ?


-- 
Ivan B. Serezhkin