On Saturday, June 25th, 2011 at 02:25:53h -0700, Ant explained:

I searched for PowerDevil and none exists even in Debian's apt-cache
search. I have never heard of it before either.

Well I did put a ? indicating if that I was not certain of the name.

PowerDevil is the name of the power management software under KDE4.

KDE3.5 uses a program called kpowersave.

http://kde-apps.ORG/content/show.php?content=29295

BTW is this issue on your Debian system whose package management
is messed up because you have apt sources pointing to updates
which include KDE4 but which you do not want installed?