The same with LEDs of GPUs and motherboards. Some GPUs for example 5700xt from Sapphire has a way to turn off using software but a lot of them for example RadeonVII I am unable to. It would be nice to have no lights whatsoever in mining rig except the one that is on ethernet port.
And why? I don´t understand this problems with the LED´s. Is it danger for your eyes? You sitting the whole day in front of your rig and watch how it runs?
