I was going to suggest updating your driver to the next version which could help, however I discussed your question with a more experienced Ask Ubuntu member on chat and this is what that member's opinion was on your question:
I saw this one - no good idea. Looks like a looping system sound.
ALSA sound drivers reside in the kernel. It usually is hard stuff to replace these with proprietary ones.
The audio dev ppa was an idea suggested HOWEVER (BIG DISCLAIMER) more often than not this can cause serious problems with your system due to the fact that they are "in development" and not fully tested so if you do decide to try this, make sure you've got a full back-up and accept that things could break.
In short if this problem isn't causing you serious pain on the ears and I'd live with it until there is a major driver update which I'd install, however until then I personally wouldn't try the audio dev ppa as of yet as its quite risky.
I'd suggest you get the next major driver update and put a bounty on your question afterwards if the problem persists and hopefully someone with more experience/knowledge about hardware and drivers will be able to help you out.