Recently I installed ubuntu12.10. It's having sound but when I attach my headphone to laptop, no sound comes from headphone. My headphone is fine as it's working fine on windows OS.
For a while I have been using a Nokia BH-604 bluetooth headphone ans everything was working fine when after I pressed a button on the headphone I lost all sound. In my attempt to fix this is tried different settings and during this I set the Mode of the device (in Settings -> Sound) to Off.