I don't think it's a malware, because disabling touchpad and trackpad (and using external mouse) works well. The second argument against malware, is that when I first saw this issue, I whipped the entire disk, re-downloaded a newer debian CD, and reinstalled from scratch. So the chances for a malware are very low.
I was thinking about something like the sensitivity of the trackpad who was thinking, even if no one touches it, that I'm clicking. But again, is it even possible to generate a click with the trackpad? In the past I played with some synaptics options for touchpad's, but does this also exist for trackpad?
Thanks again falko