This is turned off by default. If this is not set, then any calls to Suspend(),
SuspendAllowed(), Hibernate() or HibernateAllowed() will fail with an error.
The error mesage tells the user what new method to port to in logind.
I'm expecting to set --enable-deprecated for Fedora 17 and 18, but turn it off
for Fedora 19, so other distributions probably want to follow suit to find out
what other stuff needs to be ported to the new APIs early. GNOME should already
be fine, but KDE will need some solid porting as I understand it.
See http://lists.freedesktop.org/archives/devkit-devel/2013-January/001339.html
for more information on future plans and for rationale.
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