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.
There is a firmware update that fixes the issue. Contact support (email@example.com) and they will send you the firmware. You need to apply it using Windows. But it works perfectly after that.
I found a fix for my keyboard (Kogan TenKeyless with Cherry MX Browns).
I tried USB Overdrive, which worked straight away without having to configure anything further.
There's a shareware version available which nags every time you start it, but if it makes my keyboard work again, I'm happy!
newest firmware from ducky support:
I solved this problem by using Parallels Desktop
its only a workaround, keyboard will not work after reboot
It seems like a bug of OS X EI Capitan. I have updated OS X to 10.11.2 beta version and the problem has been solved! Maybe you can try update your system. Please Google OSXElCapitanPublicBetaAccessUtility.dmg, join Apple beta plan and download that dmg file, then install that, and update your system in app store. Good luck!