This is a very strange problem! I am using HP dv6000 laptop with Ubuntu 12.04. Since last few days if I open certain websites in Chrome (e.g. Gmail, Youtube, etc.) the mute button led keeps blinking with "tick tick" sound.
I am using Chrome Version 20.0.1132.47
I noticed if I disable the flash plugin in Chrome and then open those sites the problem does not appear.
Also, if battery left is less than 80% AND it is not connected to power AND some certain websites are open the problem appears.
Any idea I could get rid of this annoying problem?