While this does seem to be the opposite of the more typically reported
issue of higher resolutions not being available, the underlying cause
might be the same.  I suspect the issue is that the monitor's h/v
frequences are not getting set up correctly in the xorg.conf file, and
Xorg figures out some arbitrary resolution that happens to work, but
other expected resolutions can't be seen.

If this is true, then this bug is a dupe of 3731.

The workaround is to a) manually update your xorg.conf and specify the
horizontal and vertical sync freqs, and b) make sure the
desired/supported resultions for your card are listed in the Mode lines.

The proper solution to this bug will require additional research...

-- 
[i810] won't do lower modes on default laptop sync ranges
https://bugs.launchpad.net/bugs/16887
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