That seems strange that the USB controller (xHCI), which controls the USB ports, would be affecting the headphone port: those are 2 completely separate pieces of hardware, even on the motherboard (USB controller works with the USB headers, & the headphone/line-out jack is controlled by the onboard HD/AC'97 sound chip). Disabling the USB controller runs the risk of disabling all of the USB ports...which means no printer, no digital camera, no scanner, [probably] no mouse/keyboard, etc. That's a lot of stuff to give up just for a headset.