Sid: Probing when starting X?

[Pontus Edvardsson <pontus.edvardsson@bredband.net>]

Hi,
I'm running Sid (2.4.17) and the latest XFree86 (4.1.0-11). When 
starting X, it takes 15-20 seconds before the KDE-splash appears. In 
that time, the screen flashes about 5 times. I assume it is some kind of 
probing...

Is there any way to prevent this and specify the values manually (if 
it's probing)? It's kind of annoying not having X starting at once...

Thanks, Pontus