do device 0 use for analog (stereo and surround51) and device 1 for digital optical spdif (iec958) ?
since the default device of iec958 is also zero in usb-audio.conf post the output of alsa-info.sh -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/1051665 Title: [USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Underruns, dropouts or crackling sound Status in “alsa-driver” package in Ubuntu: Confirmed Bug description: The sound is constantly crackling when I'm listening to the music. If I listen to last.fm or youtube for instance in my Chromium browser the sound is really good. If I try to use Rhythmbox or Banshee first couple of songs may be heard fine but then crackling comes. Especially crackling starts if I launch Skype. Even if later I turn Skype off still the sound remains bad. I failed to try to redirect the sound directly to ALSA device bypassing PulseAudio server (I didn't find audio settings neither in Rhythmbox nor Banshee) so I cannot tell whether the problem depends on the server or it lays somewhere below in ALSA subsystem. Also I tried to play with default-fragments and default-fragment-size-msec values in /etc/pulse/daemon.conf but it didn't help. Then having read https://wiki.ubuntu.com/DebuggingSoundProblems page I added tsched=0 argument to load-module module-udev-detect line in /etc/pulse/default.pa. The result was not successful. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: alsa-base 1.0.25+dfsg-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-30.48-generic 3.2.27 Uname: Linux 3.2.0-30-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu13 Architecture: amd64 Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xf7b00000 irq 58' Mixer name : 'IDT 92HD87B1/3' Components : 'HDA:111d76d1,102804b0,00100205' Controls : 16 Simple ctrls : 9 Card1.Amixer.info: Card hw:1 'Pro'/'Creative Technology Ltd SB X-Fi Surround 5.1 Pro at usb-0000:0b:00.0-1, full sp' Mixer name : 'USB Mixer' Components : 'USB041e:30df' Controls : 1 Simple ctrls : 1 Card1.Amixer.values: Simple mixer control 'Power LED',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Card2.Amixer.info: Card hw:2 'NVidia'/'HDA NVidia at 0xf6080000 irq 17' Mixer name : 'Nvidia GPU 14 HDMI/DP' Components : 'HDA:10de0014,10de0101,00100100' Controls : 24 Simple ctrls : 4 Date: Sun Sep 16 22:46:15 2012 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425) PackageArchitecture: all ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/usr/bin/tcsh SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Pro successful Symptom_Card: GF108 High Definition Audio Controller - HDA NVidia Symptom_PulsePlaybackTest: PulseAudio playback test successful Symptom_Type: Underruns, dropouts, or "crackling" sound Title: [USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Underruns, dropouts or crackling sound UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/22/2012 dmi.bios.vendor: Dell Inc. dmi.bios.version: A10 dmi.board.name: 0HVRTT dmi.board.vendor: Dell Inc. dmi.board.version: A10 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvrA10:bd03/22/2012:svnDellInc.:pnInspironN5110:pvrNotSpecified:rvnDellInc.:rn0HVRTT:rvrA10:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: Inspiron N5110 dmi.product.version: Not Specified dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1051665/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp