GeForce 8800GT. Installing Ubuntu 12.10 x64 (13.04 x64).
Installing Nvidia Driver 173 - the sound on hdmi yes.
Installing Nvidia Driver 304 - the sound on hdmi yes.
Installing Nvidia Driver 310 - the sound on hdmi NO.
Installing Nvidia Driver 313 - the sound on hdmi NO.
Installing Nvidia Driver 319 - the sound on hdmi NO.
In what there can be a reason?
Very likely same as [url]New driver 310.19 broke HDMI audio on NVIDIA ION - Linux - NVIDIA Developer Forums
I don’t know is there any sense to ask you send bugreport because there is no any response on previous reports…