[Redirecting discussion to comp.sys.mac.system, as this is a system
issue, not an application issue.]
These links are relevant, with people reporting the same problem, but no
solution yet:
https://discussions.apple.com/message/18350039
https://discussions.apple.com/message/18387967
https://discussions.apple.com/message/18390549
https://discussions.apple.com/message/18390072
https://discussions.apple.com/message/18418151
https://discussions.apple.com/message/18450717
So far I've only seen confirmation of the problem affecting the late
2006 24" iMac.
Send feedback to Apple to complain about it, and clearly describe the
problem and which Mac model you have, particularly its model name and
graphics controller.
You can find those by going to the Apple menu, choosing About This Mac,
and clicking More Info, which runs System Information.
The model name is shown on the first two lines of the Overview tab. It
will probably be something like "iMac 24-inch".
The graphics controller is shown at the bottom of the Displays tab. It
will probably be "NVIDIA GeForce 7300 GT" or "NVIDIA GeForce 7600 GT",
unless the problem affects other models as well.
Here is the web link for sending feedback to Apple.
http://www.apple.com/feedback/macosx.html
(If you are a registered developer, or are willing to register, which is
free, then filing a bug report via
https://bugreport.apple.com would be
better. It has stricter requirements on how to format the report.)
Apple will need to fix this by releasing 10.7.5 or a graphics update for
10.7.4 specific to the affected models, but they need to be made aware
of the scope of the problem.
In the meantime, the only safe way I know to restore all the available
resolutions is to downgrade to 10.7.3.
The only way to do that is if you have kept a copy of the 10.7.3 or
earler version of the full Lion installer. (Internet Restore or
downloading again from the App Store won't work, because that will give
you a 10.7.4 installer.)
If your installer is 10.7.0 through 10.7.2, install the 10.7.3 Combo
update via manual download from
http://support.apple.com/downloads.
Don't use Software Update to install 10.7.4, but you can install any
other updates it offers.
It might be possible to fix this on a temporary basis by doing a hack to
restore the graphics controller drivers from an earlier version of Mac
OS X, but I wouldn't recommend trying that unless someone has published
details and confirmed it works. (I can't try this myself as I don't have
access to an affected model.)
There could be compatibility issues between older drivers and the rest
of 10.7.4 which make this hack unreliable or impossible.
--
David Empson
dem...@actrix.gen.nz