Audio troubles

hi,

I recently bought a geforce gtx 750 ti for my h.p. xw8600 workstation; my OS is ubuntu 14,04. I’m having trouble with setting up the hdmi/DisplayPort for audio playback; I’m able to get audio and visual on the external hdmi display but, there is no audio coming from the computer speakers.
nvidia-bug-report.log.gz (159 KB)