How do I find and kill whatever is using my sound card
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Do these commands (lsof, lspci) locate all the lines using /dev/dsp OR /dev/snd OR whatever? I guess, some items like vlc, gnome-volume-manager are missed. You can do one thing: just goto Applications->System Tools->System Monitor. Click on Processes. You will see some processes like gnome-volume manager, vlc etc. if at all you are running. You can kill them. Also, you have to enable the command column in Processes tab before viewing!
Yeah. It's the mixer_applet2 probably created by your GNOME sesion. You can try to turn it off or kill, but it's better to try to configure GNOME to share, if it's possible. I don't have GNOME, so I don't know...
What is your objective, I mean, why are you trying this? And yeah, among these processes, which one is using your sound device? You know, then you will have to kill almost all processes! Like, even Nautilus uses your sound device when you enable system sounds. So, why would you want to kill them? I do not understand
Is it the problem even after restarting? Try going here: (I am actually on Fedora, but have just flicked Debian!) System->(Preferences OR Administration)->Sessions. Here, goto startup tab. You can try disabling things that use your sound device (you can make out from their names) at the start up. And then see if you still have that prob. But, without disabling these, if you can get this working on a restart, better go for it!
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