Comment 2 for bug 522714

jep, that's why i set it to invalid. then i reopened it to put the right key in for the next of the 5000 people looking for a way to disable it, but it took 20 minutes to find it.

$ sudo -u gdm gconftool-2 --set /desktop/gnome/sound/event_sounds --type bool false

sorry to have wasted your time - perhaps some day gnome will actually add the gui for this to admin/login in so they don't waste everyone else's.