I have same problem. After a fresh install of Dapper the on-board SiS sound card is set as default. Go to System-->Preferences-->Sound The default sound card is listed as SiS Sl7012. Try to change to C-Media PCI CMI8738-MC8. Change accepted but not saved upon exit. Sound card immediately reverts to the SiS on-board card. The only app that I have found to get sound through the PCI card is XMMS. XMMS sound prefrences: OSS driver configured for the PCI card. -- Cant' change "default" sound card https://launchpad.net/malone/bugs/35661
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