Meh, didn't even boot. Only after I nuked the partition did I realize what the problem was. (SATA AHCI vs. Compatibility, I think.)
Anyway, it's a SoundMax AD1894, IIRC. The AD1890 and AD1896 are perfectly supported, but the 1894 is output-only, and at that, built-in speaker output only, no headphones.
The ethernet is apparently supported, though.
I think I'll try to find an OSx86 installfest or something, though... most of the documentation for my model assumes you're starting with 10.5.2 or older...