I sometimes find that the sound from my Linux G505s running 64bit Linux Mint 15 sometimes goes to Dummy Output as the output device.
What should I do when this happens(short of restarting my system)?
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Not sure if you are still facing this problem. If you do try this. It worked for me:
I also experienced that problem and tried many solutions online but none of them worked for me (though it may work in your case). You can try out those suggestions from here
If none of those worked then you can try this which worked for me.