Help: TFT LCD monitor & RedHat 8.0

My TFT LCD monitor (Acer AL501) can not work normally at RedHat 8.0. When entering X-Window, TFT shows "Out Of Range" but the X-Window can be seen either. The auto-detection values of vertical and horizontal frequency are the same as TFT spec.

Do you have any idea to help me to fix this problem? Thanks.

Chern4000
 
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