Continued problems with kernel 2.6.40.3-0 and nvidia 280.13-2 in fc15 ?

[linux guy]

I suspect the lockup during the graphical session is due to an nvidia
problem.

I'd like to downgrade to
kmod-nvidia-173xx-2.6.40.3-0.fc15.i686-173.14.31-1.fc15.1, but there are
several conflicts with various xorg files that I am not sure how to
handle.

Has anyone successfully downgraded kmod-nvidia and solved this problem ?

Thanks
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