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[Launchpad Bug Tracker <571770@xxxxxxxxxxxxxxxxxx>]

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Binary package hint: linux-image-2.6.32-22-generic

Sometimes during audio playback, a kernel thread named "[hd-audio0]"
will consume excessive amounts of CPU and cause  audio crackling. It
seems to be more easily triggered when displaying video in fullscreen
(or Rhythmbox visualizations) or dragging windows around while playing
music, somehow relating it graphics operations (running default radeon
driver with KMS and Compiz).

This all started after moving from Ubuntu Karmic to Lucid (never had
this problem before).

Setting package to kernel, since it's probably alsa snd_hda_intel kernel
module which is to blame.

Ubuntu 10.04 x86, Intel Core Duo 2GHz, 3GB RAM, ATI X1400 Radeon Mobility graphics.
Audio chip: Analog Devices AD1981 [HDA]

WORKAROUND: Disabling radeon KMS makes all the audio crackling go away.

Attaching:
* Screenshot of top running over Rhythmbox w/fullscreen visualizations, showing [hd-audio0] consuming more CPU than everything else at the time (audio crackles).
* Output of "lspci -vvnn"
* Output of "dmesg"
* Contents of /proc/interrupts
* ALSA info, as provided by the alsa-info.sh script.

Related to this: https://bugzilla.kernel.org/show_bug.cgi?id=14935 ???

** Affects: linux (Ubuntu)
     Importance: High
         Status: Confirmed


** Tags: i386 kernel-sound kj-triage lucid needs-kernel-logs needs-upstream-testing regression-release
-- 
Thread [hd-audio0] consuming excessive amounts of CPU, audio crackling
https://bugs.launchpad.net/bugs/571770
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