Experienced same issue with a Gigabyte 5.1 mother board (2013 vintage), moving the audio jack to another output solved the problem, not other changes were made to the system. OS used Ubuntu 14.04 LTS Trusty. In this case it is definitely due to incorrectly sensing the audio output jack being used.
Experienced same issue with a Gigabyte 5.1 mother board (2013 vintage), moving the audio jack to another output solved the problem, not other changes were made to the system. OS used Ubuntu 14.04 LTS Trusty. In this case it is definitely due to incorrectly sensing the audio output jack being used.