Pulseaudio uses 10% of cpu

[kolya]

Binary package hint: pulseaudio

During MP3 playback (rythmbox) pulseaudio process uses 10% of CPU. Its core2duo laptop, so I'd think it should be much less.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: pulseaudio 1:0.9.22+stable-queue-24-g67d18-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic-pae 2.6.38.2
Uname: Linux 2.6.38-8-generic-pae i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kolya 1824 F.... pulseaudio
 /dev/snd/pcmC0D0p: kolya 1824 F...m pulseaudio
 /dev/snd/timer: kolya 1824 f.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xefffc000 irq 45'
   Mixer name : 'SigmaTel STAC9200'
   Components : 'HDA:83847690,102801bd,00102201 HDA:14f12bfa,14f100c3,00090000'
   Controls : 12
   Simple ctrls : 7
Date: Fri May 6 12:11:09 2011
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
 LANGUAGE=ru_RU:en
 PATH=(custom, user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to natty on 2011-04-30 (6 days ago)
dmi.bios.date: 06/13/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A17
dmi.board.name: 0XD720
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA17:bd06/13/2007:svnDellInc.:pnMM061:pvr:rvnDellInc.:rn0XD720:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: MM061
dmi.sys.vendor: Dell Inc.
mtime.conffile..etc.pulse.default.pa: 2011-05-04T15:21:05.279731

[kolya (mar-kolya)]

Looks like the cause of the problem was my attempt to make pulseaudio contol PCM volume. I had 'load-module module-alsa-sink control=PCM' in my default.pm. Removing it reduced CPU usage to 2%.