Physics doesn't release audio device properly

[pgf]

this activity doesn't release the audio device when not using it. this will prevent an XO laptop from suspending properly, and may even prevent other programs from using the audio device.

in fact, Physics seems to open the device at startup, and never closes it until exit.

this command can help observe that the activity is doing the right thing:

    while sleep 0.1
    do  
        egrep 'closed|state' /proc/asound/card0/pcm0p/sub0/status
    done

the output should be "RUNNING" while noise is being made, and "closed" when not.

[garycmartin]

Thanks, will take a look, pygame must be opening the audio device by default even though I'm not using any sound (yet).