The problem about redhat-config-xfree86

Hello all,
        I have a problem during run redhat-config-xfree86 under Xwindow : monitor will be closed
But run it normally under text console mode. I think that is due to my driver , because it's ok under Xwindow if using vesa driver.
I found that is exec "python2.2 xconf.py"
and monitor will closed in "cv = FX86HardwareState(xconf)"
May someone know Which XFree86 functions will be called by FX86HardwareState(xconf).Or Where may I find hint?

Thanks
Harry