Comment 41 for bug 437429

@Przemyslaw
You have a point but not exactly. Notice that I mentioned disabling other sounds than System Ready. Both solutions affect the whole system. These fixes:

sudo -u gdm dbus-launch gconftool-2 --set
/apps/gdm/simple-greeter/settings-manager-plugins/sound/active --type
bool false
or:
sudo -u gdm dbus-launch gconftool-2 --set
/desktop/gnome/sound/event_sounds --type bool false

turn off all sound notifications for GDM which is OK because we don't run under GDM, but as I mentioned above, if we want to disable the GNOME Login sound (not System Ready) and we apply the same fix for the running user then all sound notifications are turned off including Empathy's since they are integrated with GNOME's.

Whereas renaming the files we do not want to play eradicates ONLY that sound notification wherever it is used. Indeed all applications that use this particular notification will not play it anymore. Fortunately the sound files seem well separated by notification so that problem does not appear.

Based on the aforementioned premises I advise people to simply rename the sounds which they do not want to hear and that will leave the other notifications on.