Public bug reported:
All sound recorded through the integrated soundcard microphone port
crackles somewhat and has extra background noise. Recording from a USB-
webcam microphone produces clear sound. I've installed the alsa dkms but
this did not help, neither did switching position reporting.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: alsa-base 1.0.25+dfsg-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
NonfreeKernelModules: nvidia
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: artanicus 2093 F.... pulseaudio
/dev/snd/controlC1: artanicus 2093 F.... pulseaudio
/dev/snd/controlC0: artanicus 2093 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'SB'/'HDA ATI SB at 0xfe600000 irq 16'
Mixer name : 'Realtek ALC892'
Components : 'HDA:10ec0892,10438436,00100302'
Controls : 46
Simple ctrls : 21
Card1.Amixer.info:
Card hw:1 'U0x46d0x807'/'USB Device 0x46d:0x807 at usb-0000:00:12.2-5, high
speed'
Mixer name : 'USB Mixer'
Components : 'USB046d:0807'
Controls : 2
Simple ctrls : 1
Card1.Amixer.values:
Simple mixer control 'Mic',0
Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
Capture channels: Mono
Limits: Capture 0 - 6144
Mono: Capture 6144 [100%] [30.00dB] [off]
Card2.Amixer.info:
Card hw:2 'NVidia'/'HDA NVidia at 0xfe080000 irq 25'
Mixer name : 'Nvidia GPU 18 HDMI/DP'
Components : 'HDA:10de0018,10de0101,00100100'
Controls : 24
Simple ctrls : 4
Date: Sun Jul 8 19:13:25 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
PackageArchitecture: all
ProcEnviron:
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/zsh
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaRecordingTest: ALSA recording test through plughw:SB successful
Symptom_Card: Built-in Audio - HDA ATI SB
Symptom_Jack: Pink Mic, Rear
Symptom_PulseAudioRecordingTest: PulseAudio recording test through plughw:SB
successful
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [To be filled by O.E.M., Realtek ALC892, Pink Mic, Rear] Underruns,
dropouts or crackling sound
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/22/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0705
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: SABERTOOTH 990FX
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0705:bd08/22/2011:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKComputerINC.:rnSABERTOOTH990FX:rvrRev1.xx:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: To be filled by O.E.M.
mtime.conffile..etc.modprobe.d.alsa.base.conf: 2012-07-08T19:11:38.449991
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug precise
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https://bugs.launchpad.net/bugs/1022318
Title:
[To be filled by O.E.M., Realtek ALC892, Pink Mic, Rear] Underruns,
dropouts or crackling sound
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