It seems that the problem could've been solved upstream:
http://bugzilla.gnome.org/show_bug.cgi?id=343759#c5
rinnan, can you confirm if the problem persists with latest updates?
Thanks!
** Bug 46080 has been marked a duplicate of this bug
** Changed in: gnome-power-manager (Ubuntu)
Assignee: (unassigned) => Alex Muntada
Status: Unconfirmed => Needs Info
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gnome-power-manager prevents suspend
https://launchpad.net/bugs/46715
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