If the thing you hear is really the console beep, it's generated by pcspkr, a kernel module ,and 'sudo rmmod pcspkr' should get rid of it.
You could even blacklist this module. -- Beep is not gnome system beep https://launchpad.net/bugs/12424 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
