How do i turn GDM sounds on?

[Mark]

> I'd say they are bugs. I see the user list, type in the password and do
>  not consider sound as important for a Graphical login which only is
>  momentarily used. There should be a sight impaired program separately
>  for login related to sound. I don't thing that there is one, but it
>  would be a valuable tool for sight limited circumstances.
>
>  Jim

Could you confirm them?
btw they are not an issue on another operating system i tried (ubuntu).