The title said it all... I have an HP dv2125nr laptop with an on board HDA Nvidia sound card. I did check the ALSA mixer and the only bar set to 0 is the one labeled IEC958 and alsamixer is not letting me change it. When it worked, it did so incredibly well, including the mute button on my laptop and disabling the speakers when I plugged something in the line out port.
The interesting thing is that the sound used to work and I did not touch the configuration in any way that I'm aware of; actually the only thing that I did to the system was installing the upgrades and a few reboots.
The system is a dual boot with windows XP MCE and I frequently swap between the two; I seem to remember that the last time the audio worked was when I plugged the laptop to a TV to play a movie; then I might have rebooted to win or turned it off before having removed the cables. (don't know if it could matter, but I'll put it there).
If anybody has any idea about where to look I'd be incredibly grateful! I have some audio editing to do and it's a bit... hard to get it done as is.



