I did not think you were being lazy
In Bianca KDE, there is kpowersave:
frontend to powersave for setting user specific policies
KPowersave is the KDE frontend for the powersave daemon. It provides
battery monitoring, suspend/standby triggers and many more features
for KDE (and GNOME).
Current feature list:
* support for ACPI and APM
* trigger suspend to disk/ram and standby
* switch cpu frequency policy (between: performance, dynamic and powersave)
* applet icon with information about AC state, battery fill and battery
* applet tooltip with information about battery fill and remaining battery
* autosuspend (to suspend the machine if the user is a defined time inactive)
* a global configurable blacklist with programmes which prevent autosuspend
(e.g. videoplayer and cd burning tools)
* trigger lock screen and select the lock method
* sound for: battery states, AC adapter events and autosuspend
* online help
* localisations for many languages
KPowersave support schemes with following configurable specific
* scheme specific blacklist for autosuspend
* notification settings
Very handy, you can just click on the "frequency" you wish your processor to run at.
Maybe worth giving Biaca KDE a try?