It turns out there's several distinct bugs being glommed together into
this one.

bug 27667 affects LCD's and results in their top most (usually
preferred) resolution being ignored.  My fix for 27667 should solve
this.  If you know your VGA-attached LCD or CRT monitor supports exactly
4 resolutions, which include 1024x768, 800x700, 640x480, and one more
that is bigger than 1024x768 but which is missing, then this is probably
your bug.

Some other proportion are seeing 94994, which occurs when the monitor
doesn't report its edid properly.  I suspect this is because xresprobe
only supports edid 1.0 style data, and some (newer) monitors report only
in edid 2.0 format.  However I've not confirmed this.  If you suspect
you fall into this category please review 94994 and help test.

I've also noticed that gnome seems to display the three resolutions
1024x768, 800x600, and 640x480 as defaults when it wasn't able to
determine the correct resolutions.  If you know your monitor supports
far more than these three, but only these three are available, then you
have this one.  Unfortunately, this is just a symptom of what's really
wrong with your system; the root cause could be a variety of things.
Check your output on "sudo xresprobe <driver>", "sudo ddcprobe", "sudo
get-edid | report-edid", verify the driver in xorg.conf is correct for
your hardware, and report your findings here.

-- 
Available resolutions incompletely set to 1024x768, 800x600, 640x480
https://bugs.launchpad.net/bugs/49827
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