[ILUG-BOM] FC6 and Display Problem

Hi, I installed FC6 on Intel Core2 Duo Processor with Intel 946 chipset.When I installed at first time it get installed with normal FC6 kernel but when I installed after few days it will get installed with "fc6xen" kernel. What it stands for? Also when I am trying to change graphical mode(X Server) to text mode(80x25) and vice versa by using ctrl-alt-F1 and alt-F7 the display gets stretched or flickering. Some time shifting of graphics to text mode and vice versa is perfect by mostly it is abnormal. Even shifting during shutdown/reboot has the same problem. How can I solve this issue.Please Help.

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