Buzzing Noise from upgrade to 11.04

[Long Chen]

I upgraded from ubuntu 10.10 to 11.04 and there is a buzzing noise from the laptop speakers.. it sounds like white noise.. I've solved it before in earlier versions but I forget what it was.. Is there a solve for 11.04

[Phil (philipelson)]

I also am experiencing white noise at a constant volume except when the volume is muted.
I have tried changing PCM settings using alsa-mixer but this did not work.

The problem can be replicated by simply booting the 64bit Ubuntu 11.04 desktop LiveCD on a Samsung R540-JA04UK laptop.

Happy to help if there is any more information I can provide.

[Phil (philipelson)]

Also, doing a
$> pkill pulseaudio
silences the interference for around 4 seconds.

[Phil (philipelson)]

I have now been able to workaround this problem with the advice from the post at http://ubuntuforums.org/showthread.php?p=10751019#post10751019

Essentially, adding the line:

options snd-hda-intel model=auto index=-0

to /etc/modprobe.d/alsa-base.conf seems to fix the issue.

[Phil (philipelson)]

Apologies, it appears that the previous post does NOT provide a workaround.

[penalvch (penalvch)]

Long Chen, thank you for reporting this bug to Ubuntu. Natty reached EOL on October 28, 2012.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Is this an issue in a supported release? If so, could you please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 776949

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]