keyboard backlight control for asus vivobook.

I recently got an Asus Vivobook S15 laptop. Exact model is M5506UA. I installed Manjaro Linux on it, everything works fine and even better by using the latest kernel available, but it's not possible to control the RGB backlight on the keyboard:

• it cycles through rainbow colors
• brightness can't be change

This project, available through AUR, fix this.