Enable DAC output

I'm running Linux 3.18.11+ #777 PREEMPT Sat Apr 11 17:24:23 BST 2015 armv6l GNU/Linux with a Hifiberry DAC installed using these instructions.

From a cold boot or reboot, I notice a buzzing in the audio.

After issuing:

aplay Closed-Hi-Hat-1.wav

(that file taken from freewavesamples.com), the buzzing is gone after the audio file finishes playing.

I suspect the initial buzzing is caused by the Hifiberry DAC not driving its audio output, either because the DAC is disabled, or perhaps because the I2S bus is disabled.

Can anyone confirm this theory ?

Is there a way to force the audio output to be enabled immediately on boot or power on ?

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