Am Montag, 22. Dezember 2014, 11:21:26 schrieb Alexandre:
> Can you post a screenshot of you searching for the keyword powersave in
> Synaptic. It is very very unlikely that it is not there.

well, problem solved :)
it turned out that
- my /etc/apt/sources.list.d/trinity.list file (which kept the entries for 
trinity) had vanished during my initial several 'dist-upgrades' (forced by 
errors)
- once fixed, aptitude found tdepowersave, which would uninstall/replace 
kpowersave upon installation

after next reboot, tdepowersave starts automatically and works as expected.
thanks for your help.

Werner