It looks like resolving this symptom requires application of these
changesets from upstream git (I've omitted the authors below, but
they're easily referenced):
commit 70dded6aba653b5f70b48fda22f9b322fd3ae2c9
Author: Clemens Ladisch <clem...@ladisch.de>
Date: Mon Nov 15 10:33:35 2010 +0100
pcm: pass hw_params flags to slave
commit 7c99bd24bcf6852d55e90e0f42f7ac5ea8f14fbb
Author: Clemens Ladisch <clem...@ladisch.de>
Date: Mon Nov 15 10:43:13 2010 +0100
support for period wakeup disabling
Add API to disable period wakeups.
commit ba9332e9192814a5431a3a2505d25d74a9232124
Author: Jaroslav Kysela <pe...@perex.cz>
Date: Thu Nov 18 09:27:07 2010 +0100
pcm: fix snd_pcm_avail_delay() function
commit aba87e509898ec9ddb3e319267d7c267409ff100
Author: Pierre-Louis Bossart <pierre-louis.boss...@intel.com>
Date: Tue Nov 23 08:47:08 2010 -0600
pcm_plugin: fix delay
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