feedback coming from Macbook Pro speakers

Bug #491425 reported by ekuenzli
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Mactel Support
alsa-driver (Ubuntu)

Bug Description

Hear a humming sound coming from laptop internal speakers. When I change preferences on audio, the sound goes away for about 30 seconds, then returns. Rather annoying. Just installed ubuntu 9.10 on the bootcamp partitionm, macbook pro 2.2.

ProblemType: Bug
Architecture: i386
 /dev/snd/controlC0: ekuenzli 1794 F.... pulseaudio
 Card hw:0 'Intel'/'HDA Intel at 0xd8400000 irq 22'
   Mixer name : 'SigmaTel STAC9221 A1'
   Components : 'HDA:83847680,106b1e00,00103401'
   Controls : 20
   Simple ctrls : 12
CheckboxCommand: alsa_record_playback
 Open the volume control application by right-clicking on the speaker icon in the panel and selecting "Sound Preferences". Select the "Input" tab and choose any alternate (non-default) device(s). Select the "Output" tab and choose any alternate (non-default) device(s). When you are done, click the Test button, then speak into the microphone. After a few seconds, your speech will be played back to you.

 Did you hear your speech played back?
CheckboxTest: alsa_record_playback_alternates
Date: Wed Dec 2 10:24:40 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
Package: alsa-base 1.0.20+dfsg-1ubuntu5
PackageArchitecture: all
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic-pae
SourcePackage: alsa-driver
Tags: checkbox-bug
Uname: Linux 2.6.31-15-generic-pae i686

Revision history for this message
ekuenzli (ekuenzli) wrote :
Revision history for this message
Brad Figg (brad-figg) wrote :

Hi ekuenzli,

Please, if you are still having issues, test with the latest development release of Ubuntu. ISO CD images are available from .

If it remains an issue, could you run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p alsa-base 491425

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to .

Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

Please let us know your results.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

tags: added: kj-triage needs-required-logs needs-test-current-image no-sound-speakers sound-macbook
Changed in alsa-driver (Ubuntu):
status: New → Incomplete
Brad Figg (brad-figg)
tags: added: karmic
Revision history for this message
Paul White (paulw2u) wrote :

Ubuntu 9.10 (karmic) reached end-of-life on April 30, 2011
Bug report did not expire due to another bug task
No reply to request for information nearly 9 years ago
Marking "Invalid" to close

Changed in alsa-driver (Ubuntu):
status: Incomplete → Invalid
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