Before flagging this question as duplicate, this is not a random or periodic clicking sound. It only happens once a sound is played on the speakers for the "first time".
"First time" being after a few seconds of silence. The audio driver could be asleep, and once a sound is reproduced it wakes up triggering a "click".
Is there any way to remove this anoying sound?
Ubuntu 14,04
NVIDIA Corporation MCP79 High Definition Audio (rev b1)