I found that fiddling with the sound settings (i.e. switching between
alsa and pulseaudio and playing the test sound until the crackling
disappears) helps: the noise would disappear until next restart.

The ath5k related periodic noise is unrelated to the absence of the
crackling noise while playing music.

-- 
Crackling noise after update to pulseaudio
https://bugs.launchpad.net/bugs/301755
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