[LightDM] lightdm fails to stop & can't change login

[Grant]

> I think it's difficult for us that don't use Gentoo. But it looks like some permission problem as you can stop them as root but not as a normal user.
> I don't know what takes care of that, PAM?
> Attached are lightdm's /etc/pam.d/ files in Fedora 17.

Thank you, can you tell me if there's a way to switch login usernames
when I'm being prompted for a password by lightdm in case I mistyped
the username?

- Grant