locking screen on suspend

[Jonathan Stott]

Hi

I'm running archlinux on my laptop, which is using xfce4.8.  I'm
asking the question here, as archlinux is just using the xfce4
distribution tarballs directly.

I've installed the xfce-power-manager program (1.0.3), and configured
it to lock the screen on suspend.  When I trigger suspending via right
clicking on the applet and ordering it to suspend, it works (though
the way my desktop sometimes flashes back a little before the lock
kicks in is a little worrying).

When I tell the session to suspend via the log out dialog, it
suspends, but doesn't lock the screen.  What configuration do I need
to enable to have the session suspend honour those settings?

Regards
Jon