BPI-M4 Leds Off

Hi, I just bought a BPI-M4 2GB, as I need to save energy, I would like to disable the 3 leds on the board, red, green, and blue. I installed Ubuntu Mate 18.04, is there a command to disable them? Here I have not found a config menu of the peripherals, is it possible to know what the command is?

I hope someone will answer me Thanks so much

Is anybody there?

I see that the forum is not very active, and these boards are physically well done, but full of problems. I need a reliable and long-lasting and active product, so I have to evaluate a product with a reliable operating system and above all with all the peripherals active and ready to use.