I've edited xorg.conf many times and supplied different options.
I am trying to use 'radeon' as a driver. Of course, I can get lower
resolution solution with 'vesa' but this is not what I would like to have.
The very strange thing is that I configured the system with the 'right' xorg.conf and I got the high resolution, 1920x1200, going. But then I've updated FC5 with the new Xorg server. And this damaged all my hard work. Most likely I could reverse the issue by re-installing, but this is not what I would like to do.
In summary, there are two issues: a working xorg.conf and why the behaviour of the system changed after up[censored] it. Of course, xorg.conf was not altered. If up[censored] damages the system, this is FC5 instability issue and should be reported as a serious BUG.
If needed, I can supply my xorg.conf and X.0.log produced with it.
However, the main issue it seems that 'dri' is not loading. So something is going on between the kernel modules and the Xorg server. Something, that sounds like incompatibility.