same problem here, also with a toshiba laptop. don't know about older kernels, 
fresh install
my alsa-info.sh output is here:
http://www.alsa-project.org/db/?f=df3b62f72eff0c1dacfcb4821e47b1b547c12505
the problem seems to be with the mixer device. alsa can't access it somehow. 
sound output actually works, but i'm not hearing anything. i'm guessing the 
sound is muted, but with no mixer acces, i can't help that.

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No sound with kernel 2.6.27, Toshiba ATI IXP SB4x0
https://bugs.launchpad.net/bugs/272205
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