thanks for this - just to clarify: am not exactly computer-illiterate, just a newbie when it comes to fiddle around with kexts (no offense taken ... problem is that there is no change in the loaded kext's on my mac whether the iSight camera is connected or not (cleared the kext cache, rebooted without the camera attached, listed the loaded kexts, attached iSight, confirmed it's working, again listed the loaded kexts... no difference.
so here the more precise version of my question: is there a tool that shows or way to find what (physical or logical) device is using what kext(s) ?