Mechanical Keyboard stopped working after upgrading to El Capitan I upgraded my rMBP 15" (mid 2015) to El Capitan and suddenly my Ducky mechanical keyboard stopped working. The keyboard doesn't light up and upon viewing System Information, it shows Current required power = 0.

Anyone experiencing this issue too?
It's related to negotiating USB power requirements I think. I was able to use mine by running it through a powered USB hub.