> # Enable basic debugging, do jiffies check and enable one shot dump of last 
> 10 ring buffer positions
> # Usefull, when the position is broken only after some of time (to reduce 
> ksyslog messages)
> echo 101 > /proc/asound/card0/pcm0p/xrun_debug

That doesn't seem to do anything.
Just to be clear, the crackling noises start immediately when playback begins; 
it doesn't take time before they start.

> most of 5.1 audio are 48000Hz
> but you try to use it as default device to play audio at any rate

Like I said before,  the problem occurs even with a 48000Hz PCM wav
file.

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https://bugs.launchpad.net/bugs/1247719

Title:
  crackling, popping, clicking in playback to audigy2 surround51 device

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