It allways controls headphones. Connecting headphones doesn't silent "front speakers". What's even worse, muting "Front" channel doesn't do that either. Muting source of the sound (PCM, CD, etc.) kills sound on speakers (and headphones).
** Attachment added: "Requested output" http://librarian.launchpad.net/4922293/info.tar -- Buttons control headphone on Intel HDA https://launchpad.net/bugs/66286 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs