David, perhaps the difficulty I am having in bug #456955 is related to
the below. Or maybe I just don't know how to write xorg.conf anymore. Thanks.
[ David Nusinow ]
* Don't write the default depth to xorg.conf any more.
The drivers should choose the appropriate depth by default now.
* Don't bother with resolutions in xorg.conf
We now rely on the server and drivers to do the right thing.