Comment 29 for bug 160871

Seems that this was really a hardware limitation, so I'll go ahead and mark it fixed.

You can add resolutions manually using xrandr - see this guide:
https://wiki.ubuntu.com/X/Troubleshooting/Resolution#Problem:%20%20The%20LCD%27s%20maximum%20resolution%20is%20detected%20automatically,%20but%20lower%20resolutions%20are%20not%20available

There's been some improvements to how this is handled in Jaunty, so if after testing that you still feel there are some problems needing to be investigated, feel free to reopen.

Regarding the problem that Screen Resolution doesn't provide a way to add additional resolutions, feel free to file a wishlist bug against gnome-control-center if there isn't already a bug report for that.