Here is the Fix for your card. paoleary was kind enough to develop a patch against Alsa 18.104.22.168 and I have it working and tested on nvidia drivers
185 - 190 - 195 - and finally 195.36.03
I have one card in a Zotac IONITX-F-E with the ion chip disable and 512Mb still shared from the bios. The card here is a GT220 Asus that I made Passive via my Zalman VNF-100 it runs less than 50C all the time in an Antec Fusion 430 with only one of the 120mm fans hooked up. I also am running XBMC, Myth 9.10 and watching Blu Rays natively via makemkv with TrueHD and LPCM - DTS-HD of course is stripped down to the core.
The other is a GT240 in an Asus P5N7A-VM again wiht XBMC - Myth 9.10 - Blu-Ray all runs fine with multi-channel audio and hdmi of the card.
On-board sound is disabled on both boards but it did not have to be. Channel Mapping still seems to be my issues and 24Hz playback of VC1 encoded files is highly unwatchable via xbmc/ffmpeg all other formats are fine at 24Hz. ffmpeg and feature set C cards have a ways to go.
Mythbuntu 9.10 - XBMC SVN27017 - NV 195.36.03 - NV GT220 - NVGT240.