If you are talking about power management, it seems to be buggy. To fix something in that area (I forget the details) I was told to amend a file in ~/.kde4/Autostart. The file is noblank.sh and commenting out the second line fixed whatever my problem was. The file now looks like this:
#!/bin/sh
xset s off
# xset -dpms
There is a man page on 'xset' which you can read in Konqueror by typing in the location bar man:xset Having now read it I may, instead of commenting out the second line, alter it to xset +dpms