Some reviews said this adapter could not transfer the sound, some said yes ... so black and white: YES, this adapter manages the sound! We must, for cons, the mini-DP port on your computer also manages the.
My config: Lenovo L430. Its tested direct connection to TV Samsung LED 2013, direct connection to BenQ w1070 and w1070 via connection to BenQ Amp A / V Yamaha RX-V675. Sound works everywhere.