[kde-linux] kde4 login problem

[shada]

My system is Fedora8,kde3.5.8 is normally, installation kde4 later, in the
login interface enter user name and password, will be the implementation of
a number of steps, the implementation of the final step, they return to the
login interface, can not enter the desktop, the video card is via/s3
unichrome, no error message, Any ideas? is this a bug?
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