kernel-packages team mailing list archive

["Kolin S. Murray" <571770@xxxxxxxxxxxxxxxxxx>]

Hi,

Apologies if this is not strictly on topic regarding fixing this bug -
what I'm curious to know is what the 'best case' workaround all of you
are using to avoid this problem? I'm open to absolutely any
distribution, desktop environment, etc. Just wondering what the best
alternative many of you have found to avoid the conflict and maintain
the most functionality.

My best case options so far: Ubuntu 10.04 LTS where I don't remember
noticing this problem, or even 12.04 in 2D if I could get my volume
control buttons to work on my Thinkpad t60.

I'm also playing with arch to see if I can build something usable I
like.

Regards,

K

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

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

Status in linux package in Ubuntu:
  Confirmed

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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