RGB Matrix Lighting Control Issues in Firmware

[dahmwern]

I'm having an issue being able to control the RGB Lighting in my keymap.c / config.h / rules.mk files. I've read through all the variants of what's offered in the QMK Guide for the Corne v4.1 Cherry Standard, but nothing seems to be able to control any lighting effects.

I've tried:
BACKLIGHT_ENABLE = yes
This doesn't work, it doesn't do anything

RGBLIGHT_ENABLE = yes
Which gives me a warning during compiling that statas that RGB_MATRIX_DRIVER is set to WS2812 already and I shouldn't activate both simultaneously.

Using both of these, I've applied various cominations of the corresponding keycodes into my keymap to no avail.

I need to try:
Adding the following to my rules.mk:
RGB_MATRIX_DRIVER = WS2812 OR LED_MATRIX_DRIVER = ???

Does anyone know how this works? I could really use the help.

[foostan]

Why do you need to set BACKLIGHT_ENABLE = yes?
Is there any issue with https://github.com/foostan/kbd_firmware/blob/main/keyboards/crkbd/qmk/qmk_firmware/rev4_1/info.json#L17 ?