

So it seems, it's working, but only the power. However, when i plug in my external dvd burner into one of those USB 3.0 ports, i can see, that the dvd burner gets power and is able to eject the dvd.

There was this one time, when the USB 3.0 ports worked with xHCI handoff deactivated and legacy support switched to auto, but after a restart, it went back to the old state: not working. Also legacy support was switched to auto, disabled or enabled, no change whatsoever. I already turned off xHCI Handoff in bios, but there is no change at all. I also was able to install the Intel(R) USB 3.0/3.1 eXtensible Host Controller Driver instead of the standard microsoft one, but that also didn't change the state of the USB 3.0 ports. The requested operation was unsuccessful.

In the device manager, there is the USB xHCI Compliant Host Controller which has a yellow triangle and following error message: This device cannot start. Somehow, my USB 3.0 ports don't work on the new ASUS Strix 270F Gaming Motherboard -> it was like that from the beginning.
