Thanks for your Inputs! @Dave: I tried allready with several depth-parameters with no effect.
I think it's really the power-management wich makes these problems. I tried another monitor yesterday and got the same troubles. Now I play arount with PM-parameters in the ServerFlags of XF86Config-4 an my BIOS. I'll post the results later here. 'til then, sondi ________________________________________________________________ Urs Sonderegger Fon +41 71 226 12 16 Fax +41 71 226 12 05 Web http://www.fhsg.ch/te FHS Hochschule für Technik, Wirtschaft und Soziale Arbeit St.Gallen Fachbereich Technik Tellstrasse 2 Postfach 664 CH-9001 St.Gallen