The sound works fine on my SparcStation 20 and a 2.4.x kernel series. Most of the people I know report succes with the 2.4 kernel series. .:: www.lola.vn ::. .:: ww88mapp1.stck.me ::. .:: independent.academia.edu ::.
If you plan to use an older kernel, you can read the Linux/Sparc audio webpage at [Developer Guide: Swift] sparcaudio which is a very good source of information about Sound support on Sun's SparcStations. [Web Specs: ASP.NET] .:: 650f.bike ::.