I've updated the description with my analysis of the problem.
Basically, some of the old Sony Vaio laptops have braindead display
panels, so X is picking default h/v sync rates which unfortunately are
too limited, so the laptop ends up with reduced available resolutions.

There isn't a simple way to fix this, since it's really hardware
brokenness here.  I can see a couple not-so-simple ways to fix it.
Unfortunately, in a cursory scan through launchpad, I'm not spotting
much hardware beyond the Sony Vaio that have this particular problem, so
am not sure it's going to be worth the effort.  But I'll keep an eye
out, who knows.  Meanwhile, Sony Vaio owners with this bug will need to
edit their xorg.conf and put in the workaround listed in the
description.

-- 
[i815] Wrong resolution on Vaio PCG-SRX51, PCG-SRX41 and PCG-FX370 due to 
incorrect h/v rates
https://bugs.launchpad.net/bugs/288807
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