Public bug reported:
Information from alsa-info.sh:
http://www.alsa-project.org/db/?f=1fc85694ab880ed02d31bc535a2555082b6c006b
As noted in the summary, there is a high-pitch crackling background
noise in recorded audio from a microphone connected to card0 (see
information above).
I noticed this as a regression from Ubuntu Karmic, where the noise was not
present.
In Ubuntu Lucid the following lines appeared in dmesg, that didn't appear in
Karmic:
[ 16.380304] hda_intel: position_fix set to 1 for device 1458:a022
[ 29.837134] hda-intel: IRQ timing workaround is activated for card #0.
Suggest a bigger bdl_pos_adj.
Trying various module-options I added the following line to
/etc/modprobe.d/alsa-base.conf, which would make the lines above
disappear in dmesg and resolve the crackling noise in recorded audio:
options snd-hda-intel position_fix=2 bdl_pos_adj=-1
I think the problem is a wrong default option set by alsa.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: stev47 1711 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xe8300000 irq 22'
Mixer name : 'Realtek ALC889A'
Components : 'HDA:10ec0885,1458a002,00100101'
Controls : 40
Simple ctrls : 22
Card1.Amixer.info:
Card hw:1 'HDMI'/'HDA ATI HDMI at 0xe5010000 irq 17'
Mixer name : 'ATI R6xx HDMI'
Components : 'HDA:1002aa01,00aa0100,00100100'
Controls : 4
Simple ctrls : 1
Card1.Amixer.values:
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]
CurrentDmesg:
[ 25.607586] ppdev: user-space parallel port driver
[ 28.003777] hda-intel: IRQ timing workaround is activated for card #1.
Suggest a bigger bdl_pos_adj.
[ 29.837134] hda-intel: IRQ timing workaround is activated for card #0.
Suggest a bigger bdl_pos_adj.
[ 35.510107] eth1: no IPv6 routers present
Date: Sat Jun 19 13:38:38 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
PackageArchitecture: all
ProcEnviron:
LANG=de_DE.utf8
SHELL=/bin/bash
SourcePackage: alsa-driver
dmi.bios.date: 03/06/2008
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F5
dmi.board.name: X48-DS5
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias:
dmi:bvnAwardSoftwareInternational,Inc.:bvrF5:bd03/06/2008:svnGigabyteTechnologyCo.,Ltd.:pnX48-DS5:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnX48-DS5:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: X48-DS5
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug lucid
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high-pitch crackling background noise when recording from microphone
https://bugs.launchpad.net/bugs/596249
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