/sys/kernel/debug/asus-nb-wmi/dsts for dev id 0x0004001B returns the same value for both states,

[ldrahnik]

so how to read current state and calculate opposite new state when interface '/sys/devices/platform/asus-nb-wmi/ is not provided?

# always returns DSTS(0x4001b) = 0x3000
$ echo "0x0004001B" > dev_id && echo "0x0000001"|"0x0000000" > ctrl_param && cat devs && cat dsts

Responsible part of DSDT table:

$ sudo apt-get install iasl
$ cd <work-dir>
$ sudo cp /sys/firmware/acpi/tables/DSDT DSDT
$ sudo iasl -d DSDT
$ cat DSDT.dsl

...
If ((IIA0 == 0x0004001B))
{
   Local0 = Zero
   Local0 |= Local1
   Local2 = 0x00010000
   Local0 |= Local2
   Return (Local0)
}
...