Most of my systems are built on linux, and linux does not have the ability to install the RGB Fusion software. For me to disable the lights on the motherboard, I have to do that from the BIOS. Here are the steps I use on my Gigabyte Motherboards:
Boot the computer
Press DEL during the boot to enter the BIOS
Scroll over to the Peripherals tab
Select RGB Fusion
Click OFF
Save & Exit
Reboot and your lights are off
Thanks for reading!