thanks a lot for the info..
i actually uninstalled the IDT driver myself. windows then will install the standard driver automatically (which is not the native IDT one) and with this driver the issue is solved. however the notebook afterwards sounds awful on the notebook speakers because the IDT driver also provided the use of all built in speakers. with the windows driver i only have a very thin ugly sound (headphone is fine though! no compression)
its half a solution for me. i have a HP envy 15 notebook pc j-013sg by the way with this useless beats audio functionality