Different screensaver on power up

view full story

http://askubuntu.com – I'm running 11.04 but I'm pretty certain this has been happening in previous releases. I have my screen saver set up to do the pictures from space but the behaviour on power up is different. When I turn on my PC in the morning and go to have breakfast, I come back to find a blank screen (it wasn't blank when it booted, it had the desktop up). I can get back the desktop in the usual ways, mouse move or space key, etc. After some activity, if I then leave the machine alone, it goes into the selected screen saver. Why is the behaviour different immediately after boot? (HowTos)