I bought the Yamaha RX-V765 a couple of weeks ago and so far I am stisfied withe sound quality, but it doesn't seem to fully support HDMI/HDCP

I can't seem to get HDMI output working correctly and I suspect a the Yamaha incorrectly handles HDMI/HDCP

I have the following config :

-sumvision HDMI DVD/Divx player

-Yamaha RX-V765 amp

-Aspire Revo (HTPC with HDMI output)

-Hitachi plasma screen

When I plug the amp to the TV and connect the DVD and the Revo to the amp, only the DVD works.

I don't have any sound when I use the HTPC through the amp. The amp detects a HDMI video signal but says there is no HDMI audio signal sent to him.

It even fails when I setup the HDMI pass through on the Yamaha!

When my HTPC is connected straight to the TV, it is working, I have the sound and the image through HDMI.

I suspect that HDCP handshake is the problem, either on my HTPC or on the Yamaha...

I hope the firmware patch due this month will fix this problem.

I found a way to mitigate the problem with my Yamaha!

I am using Linux, and apparently Linux gives much more freedom with the choice of the resolutions, and the RX-V765 doesn't seem to like that.

From what I read on other forums, some amplifiers (Onkyo and Yamaha at least) will only let the sound through if the video is in a strict HD format.

Strict HD video format is 720p, 1080i, 1080p.

Using resolutions such as 1680x1050 or 1440x900 won't work.

One of the setting of the nvidia driver takes the best available resolution and does hardware scaling to improve the quality of the image. Haing this option enbled will prevent the HDMI signal from being "Yamaha compatible"

To disable this option, start the Nvidia settings utility, go in the "GPU 0 - ION" menu, select your screen and ensure that "Force Full GPU Scaling" is DISABLED

It should allow you to get sound in spite of those stupid HDCP restrictions.