CaCO3 - 2008-08-09

When I unplug my AC adapter, after a while kpowersave creates a big CPU load.
It looks like it happens when it toggles the CPU speed down for the first time.
After I restart kpowersave, it is OK again.
What is causing this high CPU load and is there a log file to check?

Here some infos:
Qt: 3.3.8b
KDE: 3.5.9
KPowersave: 0.7.x (0.7.3)
Powersave package version: 0.15.20