high-pitch crackling background noise when recording from microphone
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
alsa-driver (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
Information from alsa-info.sh:
http://
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.
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.
ProcVersionSign
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/
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0xe8300000 irq 22'
Mixer name : 'Realtek ALC889A'
Components : 'HDA:10ec0885,
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,
Controls : 4
Simple ctrls : 1
Card1.Amixer.
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)
PackageArchitec
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:bvnAwardSof
dmi.product.name: X48-DS5
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
Status changed to 'Confirmed' because the bug affects multiple users.