My Toshiba Dynabook uses a DisplayLink-chipset for things like 1x 3.5mm headphone audio output (front) and 3x 3.5mm surround sound audio output (rear; 5.1). When setting Windows to 5.1 audio, the headphone-output only plays the stereo front audio. There should be an option inside the driver-software-interface to switch between different modes: a) headphones/surround are different audio devices, b) headphone should play all 5.1 sounds (the 3x rear audio jacks), c) the current way (just in case somebody wants it that way). Why? I see the headphone output as a way to seamlessly switch between loudspeakers and well quieter headphones. That's why the headphone-output should play the same as all 3x rear outputs.