I just installed Ubuntu 9.10 64 bit on my Asus M3N8200 m/b system. Currently I am experiencing very low sound volume out of the left speaker only. I have confirmed that sound works correctly with Windows 7 on the same system (dual boot). I have tried playing with the pulse settings, but nothing I have done will set the correct volume level or restore the right speaker.

My audio chip is:
00:07.0 Audio device: nVidia Corporation MCP72XE/MCP72P/MCP78U/MCP78S High Definition Audio (rev a1)

Any help would be appreciated.