[Realtek ALC662] Background noise from non-muted "CD playback"

[Никола Павловић]

Binary package hint: pulseaudio
BUG IS NOT FIXED YET, BUT THERE IS A WORKAROUND, SEE BELOW!
I hear buzzing on the speakers. If i play music, i can hear it but the buzzing can be heard all the time.
How to replicate:
1. Start Ubuntu 11.04
2. You will hear buzzing when the login screen appears and it will be buzzing all the time.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: pulseaudio 1:0.9.22+stable-queue-24-g67d18-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xd9ef4000 irq 23'
   Mixer name : 'Realtek ALC662 rev1'
   Components : 'HDA:10ec0662,10438290,00100101'
   Controls : 34
   Simple ctrls : 18
Card1.Amixer.info:
 Card hw:1 'CX8801'/'Conexant CX8801 at 0xda000000'
   Mixer name : 'CX88'
   Components : ''
   Controls : 3
   Simple ctrls : 2
CheckboxSubmission: b88fea8a629b4273a7d808e0460da10f
CheckboxSystem: edda5d4f616ca792bf437989cb597002
Date: Fri Apr 1 11:15:46 2011
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/27/2007
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0806
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2N-X
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev x.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.:bvr0806:bd09/27/2007:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2N-X:rvrRevx.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[David Henningsson (diwic)]

Hi,
I'm assuming it's the Realtek card and not the "CX8801" that's buzzing?
Can you please try to start "alsamixer -D hw:NVidia", try to mute "CD playback volume" and see if that makes a difference?

[Никола Павловић (nikola825)]

It works, no more buzzing.
The cx8801 is the tv card, Realtek is the buzzer.

[David Henningsson (diwic)]

Hmm, we could mute the "CD" channel by default in Ubuntu, question is if many others depend on this channel (it's pretty legacy these days...), and if that would in turn be an inconvenience for them.

[Luke Yelavich (themuso)]

Considering that CD playback is usually done digitally these days, i.e rhythmbox/banshee using gstreamer literally rip the CD and play it back through the sound card, this is certainly worth considering.

[David Henningsson (diwic)]

@Luke - it's in lp:~ubuntu-audio-dev/alsa-utils/ubuntu.natty, upload at will.

[Launchpad Janitor (janitor)]

This bug was fixed in the package alsa-utils - 1.0.24.2-0ubuntu4

---------------
alsa-utils (1.0.24.2-0ubuntu4) natty; urgency=low

  [ David Henningsson ]
  * Mute CD playback volume by default (LP: #747184)

  [ Marcin Juszkiewicz ]
  * Fixed postinst to not fail on fresh installs. (LP: #753544)
 -- David Henningsson <email address hidden> Mon, 04 Apr 2011 11:49:36 +0200