Greetings!
I'm new to the group so please bear with me if this is widely known/understood.
I was keenly interested in getting he keyboard backlight to work in Cosmo Linux Firmware V3, I asked the support at Planet Computers if there was any way to turn the Keyboard Backlight on, turns out there is (the response from the Planet Computers support folks follows:
In Linux you can adjust the keyboard backlight from the command line.
The following command will work:
“echo X > /proc/aw9524_led_proc”
Where X range from 40 (no light) to 45 (light intensity max).
Again if this is old news my sincere apologies, I hadn't come across the above info before and wanted to share it.
--BobA