Rodercot - Thanks for your pointers and encouraged to hear your GT240 is working great!
I did setup my alsa 1.0.22 using paoleary's patch and following his write up (thanks to paoleary for putting this together).
One difference I can see between our setups is, I haven't disabled the onboard audio. I have hesitated to do so as it is the only working audio output I got but maybe worth a try.
Can you please point me how to do it. Should I disable it in bios or is there a simpler way to do it?
Is ion chipset same as GT210 (sorry, not familiar with ion)?
Do you see anything else that might be wrong in my setup?
Reading some other postings, I have heard mixed responses on what to enter in /etc/modprobe.d/sound.conf.
I have tried several combinations but no hdmi sound still. My nvidia card is card1.
options snd-hda-intel enable_msi=0 probe_mask=0xffff,0xfff2
Gave some errors in dmesg with the probe_mask. Removing the probe_mask gets rid of the dmesg errors but no hdmi output.
Tried this also but no luck.
options snd-hda-intel enable_msi=0 index=1
I don't know if these make a difference for GT210. Can you post your working sound.conf?
If anyone has a working (from hdmi audio perspective) sound.conf for GT210, can you please post it.