I am using Fedora 12 (x86_64) with a GT220 (Asus BRAVO 220 SILENT/DI/1GD2(LP) (I updated the xbmc wiki) with the latest stock kernel and alsa packages. I only, manually, updated the alsa drivers to a recent alsa snapshot from
http://ftp.kernel.org/pub/linux/kern...a/alsa-driver/.
I see you use updated alsa drivers from atrpms. I guess 1.0.23 should be new enough.