[Bug 579117] [NEW] Wireless blocks USB-Audio, leading to dropouts

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This problem did not occur in 9.10 or earlier.  It may be related to bug
388081.

I have an external USB audio device, a HeadRoom Total BitHead.

In 10.04, while playing music with Rhythmbox, every few minutes the
sound will stutter.  I have added the following line to
/etc/pulse/client.conf:

extra-arguments = --log-target=syslog --realtime=1 --high-priority=1
--fail=1 -vvv

which makes messages like the following appear in the system messages
file:

May 11 19:40:42 temuko pulseaudio[1311]: alsa-sink.c: Underrun!
May 11 19:40:42 temuko pulseaudio[1311]: alsa-sink.c: Increasing wakeup watermark to 30.00 ms
May 11 19:40:42 temuko pulseaudio[1311]: alsa-sink.c: Underrun!
May 11 19:40:42 temuko pulseaudio[1311]: alsa-sink.c: Increasing wakeup watermark to 34.99 ms

I also added my userid to the pulse groups and the sound group (this
plus the extra arguments noted above are suggested as a workaround but
do not seem to have much effect).

I have also tried the following in /etc/pulse/default.pa:

load-module module-udev-detect tsched=0

which again seems to have no effect, although it may be there is a
subtle difference in the stutter sound.

There is another sound card (built in) that I could try if that seems
like a useful experiment.  I would also be willing to try other
debugging.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  clh        1311 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'IXP'/'ATI IXP rev 0 with ALC250 at 0xd0004400, irq 17'
   Mixer name	: 'Realtek ALC250 rev 2'
   Components	: 'AC97a:414c4752'
   Controls      : 33
   Simple ctrls  : 21
Card1.Amixer.info:
 Card hw:1 'Modem'/'ATI IXP Modem rev 1 at 0xd0004800, irq 17'
   Mixer name	: 'Silicon Laboratory Si3036,8 rev 7'
   Components	: 'AC97m:53494c27'
   Controls      : 3
   Simple ctrls  : 3
Card1.Codecs.codec97.0.mc97.1.1:
 1-1/0: Silicon Laboratory Si3036,8 rev 7
 
 Extended modem ID: codec=1 LIN1
 Modem status     : GPIO MREF ADC1 DAC1 PRE(ADC2) PRF(DAC2) PRG(HADC) PRH(HDAC)
 Line1 rate       : 8000Hz
Card2.Amixer.info:
 Card hw:2 'default'/'Burr-Brown from TI               USB Audio CODEC  at usb-0000:00:13.0-3, full s'
   Mixer name	: 'USB Mixer'
   Components	: 'USB08bb:2900'
   Controls      : 2
   Simple ctrls  : 1
Date: Tue May 11 21:09:57 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_CA.utf8
 SHELL=/bin/bash
SelectedCard: 2 default USB-Audio - USB Audio CODEC
SourcePackage: alsa-driver
Symptom: audio
Title: [USB-Audio - USB Audio CODEC ] Playback problem
dmi.bios.date: 11/16/2004
dmi.bios.vendor: TOSHIBA
dmi.bios.version: V1.50
dmi.board.name: EDW10
dmi.board.vendor: TOSHIBA
dmi.board.version: Null
dmi.chassis.asset.tag: *
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnTOSHIBA:bvrV1.50:bd11/16/2004:svnTOSHIBA:pnSatelliteA70:pvrPSA70C-RX100E:rvnTOSHIBA:rnEDW10:rvrNull:cvnTOSHIBA:ct10:cvrN/A:
dmi.product.name: Satellite A70
dmi.product.version: PSA70C-RX100E
dmi.sys.vendor: TOSHIBA

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: apport-bug i386 lucid
-- 
Wireless blocks USB-Audio, leading to dropouts
https://bugs.launchpad.net/bugs/579117
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