Comment 49 for bug 433654

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Igor Wojnicki (wojnicki) wrote : Re: [Karmic]&[Lucid] Only one user has sound; no hw shows in Sound Preferences

PS2. Disabling 'Use audio device' removes the user from audio group. And since /dev/dsp is acl controlled, access to it is granted to the user which currently uses the display. I guess that the ACL magic is done by policykit/udev - but i'm not sure though.

So, to enable sound switching with user switching, just remove your users from audio group.