How to make scren resolution sticky?

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http://forums.opensuse.org – I have chosen to use automatic login. But every now and then I am asked for username and password when the computer boots. When I do get automatically login the screen resolution is changed to 800 x 600 instead of 1280 x 1024. How do I get those two (resolution and log in) settings sticky? Graphics: Nvidia GeForce FX 5200 (updated today!) SuSE Linux 11.2 KDE 4.3.5 (Distributions)