I just installed the new Ubuntu 12.10 on my laptop and when I installed google-chrome I started seeing this errors logging all along the terminal, which it wasn't so friendly at all:
ALSA lib pcm_dmix.c:957:(snd_pcm_dmix_open) The dmix plugin supports only playback stream
So, the solution I've found on the internet was easy as running this command:
After that just restart the browser and problem solved.
Hope that helps. Cheers!