Re: GTS 450 no HDMI audio in Ubuntu
For your information, your pictures are not working over here.
I would like to tell that I have the same problem in 10.10 beta amd64 with GTX 460. It works fine under Windows 7. It's not the same card as yours but from what I understand both these have sound onboard the graphics card.
I tried the latest Maverick mainline 2.6.36-rc5 kernel from the kernel-ppa repository and the HDMI audio chip is available in sound properties.