kernel-packages team mailing list archive

[Vassil Panayotov <vd.panayotov@xxxxxxxxx>]

Just for the record I've tried Kubuntu 12.04.02 and the kwin_gles workaround does _not_ work for me unfortunately(T60 w/ X1400) . There are still messages like "CE: hpet increased min_delta_ns to 20113 nsec", and the wireless is very slow. This issue is very frustrating and is the first time when the open source model fails to work for me. I mean this report was filed 3 years ago, affects thousands of people, there is no good workaround and yet no one from the "radeon" developers seems to care.
I wonder if we can raise money and put together a bounty or something...

(posted this on https://bugs.launchpad.net/bugs/879790 24 hours ago but
for some reason it's not synchronized yet, so posting it here "manually"
too)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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 ???

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/571770/+subscriptions