I don't know if it is related but if you found out more about screen dimming problems I'd like to know.

I have the same problem without using skype. I don't use skype at all, actually I don't think it's even installed. But if I use any program for more than a few minutes my screen stays on permanently.

If I change settings in the display settings in control pannel and apply them the problem goes away. (at least for some time)...

any ideeas?