Location of the cfg files for this are in /sys/class/leds. Here I have a few Input values, when I try to edit capslock, all I have to do is set /sys/class/leds/input3::capslock/brightness with 0/1, and the led works. But I can't find the file the kbd-backlight. I'm on Linux Mint 18.

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    There is no such thing, backlighting is a proprietary extension. Some keyboards do have Linux utilities for changing backlighting, others don't. It's in no way standardised, each vendor does it a different way. – Satō Katsura Nov 6 '16 at 8:50

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