I tested Matin's suggestion. The fallback works properly if
/etc/X11/xorg.conf is simply not present.

I moved the nvidia-current.ko aside, restarted. The X.org.0 shows that
the order of preference for the autoconfigured drivers is: 0: nvidia 1:
nouveau 2: nv 3: vesa 4: fbdev. In this case, nouveau is chosen.
Metacity starts.

Jockey ('Additional Drivers') shows that Nvidia is "activated and
currently in use", even though lsmod, Xorg.0.log and glxinfo concur that
it is not in use.

I restored the nvidia driver file. I was tried to switch drivers by
logging out and in, but nouveau was still used. Then I restarted gdm,
but nouveau was still used. I didn't try rmmod and modprobe. After
rebooting, however, nvidia was used again as the preferred default.

The only (minor) disadvantage is that the nVidia splash screen displays
(for <1 second) when it loads, because the 'Option "NoLogo" "True"' is
no longer being read from the non-existant xorg.conf

This is with 
Natty Daily 2011-03-18
Linux 2.6.38.7.21
nvidia-current 270.30-0ubuntu3
xorg 1:7.6~3ubuntu11

amd64/mac
GeForce GT 330M

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https://bugs.launchpad.net/bugs/522061

Title:
  Nvidia proprietary drivers fallback test failed

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