I recently installed Ubuntu 12.10 on one of my machines that I am planning to use as HTPC. It has Galaxy Geforce GT-610.
I connected my machine to SONY STR-DN1030 receiver as input and output from the receiver goes to Epson 3010e projector. I installed XBMC latest release candidate (I believe RC3) and setup the audio output to HDMI SONY AVAMP and pass through output to HDMI SONY AVAMP.
I set up the sound input as HDMI and speaker as 7.1. I can hear sound from all 7 speakers and sub woofer but I also hear the sound coming from the projector. This is causing a little echo effect. I would appreciate if someone let me know how I can resolve this issue. Thanks in advance.