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[Bug 571770]

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Neven Klacar <nklacar@xxxxxxxxx>
Date: Mon, 19 Jan 2015 04:10:46 -0000
Reply-to: Bug 571770 <571770@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

The wifi I tried disabling the sound quaility is still bad when doing
anything display intensive. I havent tried disabling alsa altogether to
see if the wifi is still dropping..

I wanna say when I first come up with MSI fixed version it sounds fine,
youtube also sounds normal, but if I make the unity taskbar show up,
then it goes into some sort of bad state where sound is bad again..maybe
the clock switch in the gpu clock or cpu? Not sure....

I need to do some more experiments, haven't had the time.

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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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