You could also try removing this line from /etc/modprobe.d/alsa-
base.conf

options snd-hda-intel power_save=10 power_save_controller=N

The line can be found at the end of the file.

-- 
[solved with workarround] speakers making a buzzing noise when computer is in 
"idle"
https://bugs.launchpad.net/bugs/507203
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