** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1433382
Title:
[USB-Audio - SB X-Fi Surround 5.1 Pro, playback] Static, crackling
sounds using module-loopback
Status in alsa-driver package in Ubuntu:
Incomplete
Bug description:
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
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