Ubuntu
alsa-driver package

  1. Bug #477154
  2. Comment #4

Comment 4 for bug 477154

Revision history for this message
Daniel T Chen (crimsun) wrote : Re: [Bug 477154] Re: When headphones are plugged in, the speaker does not get muted automatically.

This doesn't seem to be the latest; you'd want to install
linux-backports-modules-alsa-karmic-generic and reboot.