Please try the solutions in the following thread:
http://askubuntu.com/questions/135804/want-sound-only-to-headphones-when-it-plugged-in-and-in-speakers-else
See answer from stehpan (user64643)
Please try the solutions in the following thread:
http:// askubuntu. com/questions/ 135804/ want-sound- only-to- headphones- when-it- plugged- in-and- in-speakers- else
See answer from stehpan (user64643)