New driver 310.19 broke HDMI audio on NVIDIA ION - NVIDIA Developer Forums
Driver update from 304.64 to 310.19 broke HDMI audio playback in my Zotac NVIDIA ION (MCP79) - based system. Downgrading to 304.64 fixes the problem but I think it's bad solution for the future. I tried to change mixer settings using alsamixer and misc .....