Comment 2 for bug 619476

The attached user configs indicates a configuration problem:

 - the mplayer output shows that mplayer doesn't try to use pulseaudio at all, but goes via alsa directly
 - the alsa library fails to open the device, most likely because some other application is already holding the device open
 - the mplayer configuration was altered to not use pulseaudio
 - the user alsa configuration contains only comments, but the commented out configuration indicates that the system had at some point two audio cards. This indicates the user has some experience with customizing alsa

I suspect that a pulseaudio daemon is running and blocks the device from being used from other applications. IMO the correct fix is to revert the configuration change and use pulseaudio.