The culprit was a missing, incompatible change in alsa-lib's
snd_pcm_hw_params_choose() that PulseAudio relies on. Because Karmic
does not ship the changesets required, you're seeing pretty horrible
performance. I've uploaded a staging version of alsa-lib with these
fixes to the ubuntu-audio-dev PPA. Please test and verify that it
resolves the issue for you.
** Package changed: pulseaudio (Ubuntu) => alsa-lib (Ubuntu)
** Changed in: alsa-lib (Ubuntu)
Status: New => Fix Committed
** Changed in: alsa-lib (Ubuntu)
Assignee: (unassigned) => Daniel T Chen (crimsun)
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Game that uses ALSA's sound crackles/dies quickly in Karmic
https://bugs.launchpad.net/bugs/485488
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