See also: http://askubuntu.com/questions/490813/audio-flicking-at-back-port with a description of the problem (in that person's case, the back port instead of the headphone jack)
See also: http:// askubuntu. com/questions/ 490813/ audio-flicking- at-back- port with a description of the problem (in that person's case, the back port instead of the headphone jack)