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I've followed this :

Howto - Resolve no sound problem on Ubuntu 12.10, 12.04 and Older

In addition, I've disabled auto-mute in alsamixer. If I play a sound under VLC, I can see in pavu, that there's something playing - that the volume is registered - yet I hear nothing.

I recall my sound working prior to about a week ago, but it seems to have abruptly stopped on its own.

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After doing a lot of experimenting today, I think this is related to the latest kernels, as on -18 and had no nvidia driver but had sound. As soon as I manually installed the headers and manually installed nvidia-current, I now have no sound. Any ideas on how to restore? –  steorra Nov 19 '12 at 3:41
    
You can try removing NVidia drivers and re-checking the results. –  VedVals Nov 19 '12 at 7:55
    
I've done that, and have sound then. Coincidentally, I also loaded Linux Mint 14 RC and had the same experience out of the box. –  steorra Nov 21 '12 at 1:40
    
Update : Now I lost my sound! Fiddled with alsamixer as per link. Now only one earphone slot works. No sound from speakers. –  VedVals Nov 21 '12 at 7:13
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1 Answer

Reloading the sound driver has a very good chance of solving your problem:

sudo /sbin/alsa force-reload
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