Ubuntu 12.04 with xfce - Suspend button only shows screensaver, Not suspending

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http://askubuntu.com – Running Ubuntu 12.04 with xfce desktop. When I do a suspend my monitor fades to black, prints some information to a console, and then shows the screensaver. It does not suspend. This happens when I choose Suspend from my Panel widget, or when I run "xfce4-session-logout --suspend" What are the next steps to diagnose this? Any ideas what might be broken? (HowTos)