Screen resolution must be selected at every reboot

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http://forums.opensuse.org – I am using a Lenovo T500 Thinkpad with 1680x1050 display. Most of the time I do not use the built-in Lenovo display, I use an external 1920x1200 display instead. Every time I reboot, I have to use Configure Desktop > Display to change the resolution from pre-selected 1680x1050 to 1920x1200 (Auto). See image below. What can I do to avoid having to do this at every restart? I have noticed the problem in OpenSuSE 11.2 and 11.3, not before. . (Distributions)