15

I was playing music with my headphones plugged in. The music was coming out of the headphones, but I also noticed that my speakers were playing the same music.

Why is this, and how can I fix it?

9

This is probably an alsa issue. I had the same problem, but it got reported as a bug and fixed.

link to bug report

  • +1: This is an ALSA bug. In addition to whatever workaround you can get, please file it - our audio maintainer is pretty good with these :) The driver needs to have a correct mapping of all the various inputs your sound hardware has - one of which is a “you've got headphones plugged in” signal - and not all systems have correct mappings. Running “ubuntu-bug” should get you the symptoms-based reporter, where you can get the relevant audio logs to a bug. – RAOF Jul 29 '10 at 2:58
  • It has worked for me since the upgrade to 10.10 on hda intel platforms. the previous solution was to open sound preferences, which triggered a probe and changeover to headphones. in my opinion, not a bug...tradeoff for speed increase by not polling the interface – RobotHumans Nov 29 '10 at 21:03
5

I had the same issue. It appears that the new kernel did not correctly detect the sound card model that you have. You will have to edit the /etc/modprobe.d/alsa-base.conf file and set the model manually with

options snd-hda-intel model=<model>

Unfortunately, finding the correct sound card model can take a little guess work. I took me several tries to find the sound card model that would detect the headphones correctly.

This link gives a list of sound card model: http://ubuntuforums.org/showthread.php?t=1043568

More information can be found on the Ubuntu Wiki.

  • If you have to do this, file a bug too; the kernel should detect the module automatically. – Jeremy Kerr Jul 29 '10 at 5:57

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