I was trying to upgrade from squeeze to wheezy and have
found
kpowersave-trinity, though it appears on the taskbar, doesn't seem to
register anything; it just says, "disable actions on
inactivity/Help/Quit".
Not sure which version of TDE you are running, anyhow in
the main development trunk kpowersave has been replaced by tdepowersave.
Cheers
Michele