Hi,
We have a problem with the sound. The latest drivers cause temp sound loss. The sound returns after speakers mute-unmute in Windows sound properties.
We made the test on IPC AOpen 67-ha with DisplayPort and DVI. The sound comes from the IPC(computer) to the display via DispayPort. Intel Display Audio device is the default. The sound appears to be in the system, but not on real device.
The sound works fine through dvi. If two displays plugged in (using DisplayPort and DVI) the sound is okay.