Why /sbin/poweroff -fp?

Warren Togami <[email protected]>
Newsgroups gmane.linux.terminal-server.devel
Message-ID <[email protected]>
gtkgreet/greeter.c:    g_spawn_command_line_async("/sbin/poweroff -fp", 
error);

Why poweroff -fp?  What is the benefit of this over plain poweroff?

On my Fedora chroots if I select Shutdown from the LDM greeter it seems 
to halt but fails to poweroff the machine.

Warren Togami
[email protected]

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