UPower signals

[Peter Weilbacher]

I am trying to detect suspend / hibernation cycles using UPower. But I 
don't see any of the signals documented on 
<http://upower.freedesktop.org/docs/UPower.html>. I tried a test program 
written by myself but also dbus-monitor and upower -m without success. 
In the archives I found a message from July 18th about the same issue 
(title: Why are UPower "Sleeping" and "Resuming" signals not 
generated?), which unfortunately didn't receive any replies... Is there 
a different method to access these properties that I should prefer over 
UPower?

Grateful for any hints,
    Peter.