Possible Duplicate:
How do I disable the startup sound in Ubuntu 12.04 login-screen?
Yes I know this is an old chestnut, but I can't find a solution for my case. I want to disable the drum-beat logon screen sound, but I can't use the standard recipe of system > preferences > startup applications > logon sound because I'm using gnome-shell and there isn't a system preferences menu.
So: if I did make the change as specified for Unity, what config file(s) would be changed on disk? If I know that, I can make the change myself. The trouble with answers that just say "pull up this menu and untick this box" is that I can't tell what's actually going on under the hood.
