|There are some diagnostic tools you can download to give that info. Here's one:|
If it's on-board sound then try to find the motherboard model number with the SIW results. With the motherboard model number we should be able to download the drivers from their site.
If it's a add-on sound card then it should show which c-media audio controller you have and we can find the drivers from the c-media site or places like driverguide.
Ubuntu Cheeta, Ubuntu !