Public bug reported: I recently hooked up a SB X-Fi Surrount 5.1 Pro external sound card to my computer. It has a Line-In port which I wanted to use for playing audio from another computer. I enabled the loopback module like so:
pactl load-module module-loopback And although I could then hear sound from Line-In, it was distorted by static, crackling sounds. I took the advice I found here: https://wiki.ubuntu.com/Audio/PositionReporting Making this change to /etc/pulse/default.pa: load-module module-udev-detect tsched=0 After rebooting and again loading the loopback module, the playback was static-free. As instructed by the above webpage, I'm filing this bug to track the issue and suggested solution. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: alsa-base 1.0.25+dfsg-0ubuntu1.1 ProcVersionSignature: Ubuntu 3.2.0-77.114-generic 3.2.66 Uname: Linux 3.2.0-77-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu17.8 Architecture: amd64 Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xfa620000 irq 95' Mixer name : 'Realtek ALC898' Components : 'HDA:10ec0899,104384d8,00100003' Controls : 47 Simple ctrls : 23 Card1.Amixer.info: Card hw:1 'Pro'/'Creative Technology Ltd SB X-Fi Surround 5.1 Pro at usb-0000:00:1d.0-1.3, high ' Mixer name : 'USB Mixer' Components : 'USB041e:3237' Controls : 0 Simple ctrls : 0 Card1.Amixer.values: Card2.Amixer.info: Card hw:2 'NVidia'/'HDA NVidia at 0xfa080000 irq 36' Mixer name : 'Nvidia GPU 16 HDMI/DP' Components : 'HDA:10de0016,10de0101,00100100' Controls : 24 Simple ctrls : 4 Date: Tue Mar 17 21:02:47 2015 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328) MarkForUpload: True PackageArchitecture: all ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: alsa-driver Symptom: audio Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Pro successful Symptom_Card: GF114 HDMI 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: 04/10/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1104 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: P9X79 PRO dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1104:bd04/10/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP9X79PRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer ** Affects: alsa-driver (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug precise running-unity third-party-packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1433382 Title: [USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Static, crackling sounds using module-loopback To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1433382/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
