When I wake up the machine from hibernation, the screen is distorted (lots of colours etc) for som seconds before the password window appears. Have I configured my screen wrong, or is the settings I have made in powersave wrong?
No, everything is normal. You probably could file an enhancement request for the Xorg driver of your video card to blank the screen on resume, but i guess it would be pretty low priority for them.
Thanks for the answer. It's good to know that my setup is ok.