How to use RGB keyboard on linux?
Solution 1:
Open the terminal, this can be done via the applications UI in the bottom left. ctrl+T might also work.
Then you will want to type in: man xset
This is the manual for xset. If you are new this sort of thing it might come over as intimidating, but don't worry.
If you scroll down a little you will find there to be a tab for 'led'. Read it. .......... You done? Great!
To return to the command line press: q
Okay, so in your case the command 'xset led' should work, try it!