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[Øyvind Stegard <oyvinst@xxxxxxxxxx>]

This bug is really just bug 879790, set status to duplicate or close.
Either way I will not be able to test, as I gave up on using Linux on
the machine due this problem. And now it is obsolete and dusty.

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https://bugs.launchpad.net/bugs/571770

Title:
  Thread [hd-audio0] consuming excessive amounts of CPU, audio crackling

Status in X.org XServer - ATI gfx chipset driver:
  Confirmed
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  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 ???

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