Hi guys,

finally i fixed all my problems on my XPS 15 with MAXXWAVE by downloading and installing this driver: Audio_Realtek_W814_A01_Setup-2FM7N_ZPE.exe

1) Download the file here http://www.dell.com/support/home/ed/en/eddhs1/Drivers/DriversDetails?driverId=2FM7N

2) Install it without uninstall anything and restart Windows 10/8

3) Enjoy it

Bye!!