I followed the steps as described in the first post and got sound working (don't need 5.1). Also, everything shows just fine on System Profiler.

The problem is that although "Headphones" shows in System Profiler, I can't choose it as output.

My motherboard is a Gigabyte P35C-DS3R, using Snow Leopard 10.6.1 (the same thing happened in 10.6)

I don't need a pre-made solution. If someone could at least point me to where I should edit (DSDT, plist, etc), it would be much appreciated.

Thanks.