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nVidia Corporation MCP51 High Definition Audio FIX
I have had lots of problems with the nVidia Corporation MCP51 High Definition Audio (rev a2) audio chip things like the headphone jack not working it is all down to the ALSA drivers what you need to do is download OSS drivers from http://www.opensound.com/ and set the OSS drivers as your default sound. i have tested this with Ubuntu 9.04 on Medion MD98300 Notebook.