I don't have time to try and tackle this, sadly, but I did notice
something potentially useful:
Part of your problem could actually be a bug in update-manager.
update-manager tries to use the org.gnome.PowerManager interface to inhibit
sleep before it tries the freedesktop standard
(org.freedesktop.PowerManagement) that xfce-power-manager uses. This could
start gnome-power-manager unnecessarily.
That may not fix your problem completely, but it's a start.
As posted earlier, you should be able to just get rid of gnome-power-
manager to fix this problem.
** Also affects: update-manager
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/702418
Title:
Two power managers started
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