OpenSuse JEOS screen resolution setting


How can I set the screen resolution on JEOS.I tried “xrandr” but it returns “can not display”.

Wen I open tslib to calibrate touch screen it uses xres:1024 yres:768 I just want to fix all to 800x600 .

Pls help

I never seen this kind of forum.

pls someon just mention about how to change screen resolution.I think it is default 1024x768 I want to change it 800x600 for embedded device.