Hello crhendo
I have found the solution now.
I change the HDMI receiver input from DISPLAYPORT to HDMI out.
Deinstall grafic en audio drivers.
Install the latest drivers from 5-3-2014.
Set the audio source in the Sony TV from general to HDMI.
And its works now.
Have audio and video on Sony tv and Yamaha receiver.
Best regards
SEAT1951