Also happens to me.  Ubuntu 12.10 on i386.
1. Press physical power button on Dell 1420n laptop computer
2. Menu appears, select "Suspend"
3. Expect computer to suspend (which does work from gear-like Unity menu and 
Suspend option)
What actually happens is computer does not suspend, also appears output in 
$HOME/.xsession-errors:
gnome-session[1921]: libupower-glib-CRITICAL: up_client_get_can_suspend: 
assertion `UP_IS_CLIENT (client)' failed

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https://bugs.launchpad.net/bugs/1041137

Title:
  Activating suspend from power button menu does not work

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