work around but it works
I set the power_save to a high value in /etc/modprobe.d/alsa-base.conf so it 
never sleeps.
Perhaps someone finds a better solution.

# Power down HDA controllers after 10 idle seconds
options snd-hda-intel power_save=300000 power_save_controller=Y

-- 
alsa power-saving ambarass my laptop's mute led
https://bugs.launchpad.net/bugs/456769
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