I'm 05 days trying to decrease and increase the brightness of my keyboard through the Fn + F9 -> Decrease and Fn + F10 -> Increase keys and I can't. I've tried everything but it doesn't work. As I have already adjusted the whole system and I am afraid of giving a problem, I am avoiding moving too much.
My Notebook model is the Samsung series 9 np900x3c. The version of my Elementary OS is the current version on the site right now.
The help answers I found on the site refer to adjusting the brightness of the screen, but that is not my case. I need to correct the keyboard brightness using the Fn - F9 / F10 keys.
When I press them, the animation of increasing and decreasing brightness appears on the screen, but this does not happen in practice. When I press Fn - F2 / F3 to adjust the brightness of the screen, it works normal.
I thank the attention.