NVIDIA, ATI, psb config for F14

[Adam Williamson]

So, it seems less and less likely that this is going to be fixed by F14
GA:

https://bugzilla.redhat.com/show_bug.cgi?id=623742

which means *-config-display won't work, which means enabling nvidia,
fglrx and psb won't work as currently packaged.

So here's a suggestion: we could replace the use of the *-config-display
tools to write xorg.conf by simply writing static snippets
to /etc/X11/xorg.conf.d in %post or from the services. For psb this
should be trivial as it's an RandR 1.2 driver, I really only need to
specify the driver name and a couple of options. I think it should also
be feasible for nvidia / fglrx since they do use EDID detection these
days - I don't think the stuff actually needed in an xorg.conf snippet
to enable these drivers has to vary between systems, we should be able
to just make it a simple snippet.

What does everyone think of this approach, does it seem sensible? It'd
be nice to push this out to be ready for GA next week.
-- 
adamw