01-13-2011
You can install lsof which will list everything that has open files and sockets on your system. look for things that have /dev/sound/ or /dev/dsp or things like that.
One odd thing I've discovered with firefox and flash is that programs it launches also inherit an open sound device! if firefox is hogging the sound device, and firefox launches xpdf, and you close firefox completely, xpdf will still hog it! It is very bizarre.
If you can turn off OSS emulation completely and use alsa exclusively, hogging shouldn't be a problem. I don't know exactly how to do this in fedora though.
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