I used another workaround. I put the following line in 
/etc/modprobe.d/alsa-base. 
This way after the resume I get the sound back without having to restart alsa.

options snd-hda-intel model=6stack-dig

Probably you have to adapt it to your sound card model with the alsa
documentation and some trial-and-error (that's what I did).

-- 
[hardy] After suspsend sound isnt working anymore
https://bugs.launchpad.net/bugs/198218
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