pulseaudio skipping

Binary package hint: pulseaudio

After having sound playing for an extended period of time, sound sometimes starts "skipping". Following the instructions of https://wiki.ubuntu.com/PulseAudio/Log I found numerous lines like the following occur during the "skipping":

(3456.283| 0.000) D: protocol-native.c: Requesting rewind due to rewrite.
(3456.283| 0.000) D: alsa-sink.c: Requested to rewind 18760 bytes.
(3456.283| 0.000) D: alsa-sink.c: Limited to 18760 bytes.
(3456.283| 0.000) D: alsa-sink.c: before: 4690
(3456.283| 0.000) D: alsa-sink.c: after: 4690
(3456.284| 0.000) D: alsa-sink.c: Rewound 18760 bytes.
(3456.284| 0.000) D: sink.c: Processing rewind...
(3456.284| 0.000) D: sink-input.c: Have to rewind 18760 bytes on render memblockq.
(3456.284| 0.000) D: sink-input.c: Have to rewind 18760 bytes on implementor.
(3456.284| 0.000) D: source.c: Processing rewind...

The full debug log is attached.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu21.1
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jpiche 13064 F.... pulseaudio
 /dev/snd/pcmC0D0p: jpiche 13064 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf8900000 irq 52'
   Mixer name : 'Realtek ALC272'
   Components : 'HDA:10ec0272,17aa4008,00100001'
   Controls : 19
   Simple ctrls : 10
Card1.Amixer.info:
 Card hw:1 'Generic'/'HD-Audio Generic at 0xf8420000 irq 54'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100200'
   Controls : 4
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
Date: Mon Nov 15 22:45:08 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 (20100928)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: pulseaudio
dmi.bios.date: 06/14/2010
dmi.bios.vendor: LENOVO
dmi.bios.version: 30CN58WW
dmi.board.name: KL3
dmi.board.vendor: Lenovo
dmi.board.version: Rev 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Lenovo
dmi.chassis.version: Rev 1.0
dmi.modalias: dmi:bvnLENOVO:bvr30CN58WW:bd06/14/2010:svnLENOVO:pnIdeaPadY560:pvrRev1.0:rvnLenovo:rnKL3:rvrRev1.0:cvnLenovo:ct10:cvrRev1.0:
dmi.product.name: IdeaPad Y560
dmi.product.version: Rev 1.0
dmi.sys.vendor: LENOVO