Bug#486007: gnome-session stalls logout when gnome-power-manager is not installed

[Vagrant Cascadian]

Package: gnome-session
Version: 2.22.3-1
Followup-For: Bug #486007

i seem to also experience this bug on a reasonably clean install.

if i log in and click on System -> "Log Out" and click on "Log Out" on
the dialog, the dialog disappears and nothing happens for 1-2 minutes,
and then it actually logs out without notice. if i start up Applications
-> Accessories -> Terminal, it almost immediately logs out.

if i install gnome-power-manager, the problem goes away.

if i remove gnome-power-manager, the problem returns.

i also get messages in ~/.xsession-errors:

  ** Message: Could not connect to power manager: Could not get owner of name 'org.freedesktop.PowerManagement': no such name

live well,
  vagrant