What video card and what driver?
You might try
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sudo dpkg-reconfigure -phigh xserver-xorg
grub has nothing to do with video
There are two separate questions here that are unrelated.
1. is about the hardware database for monitors and their resolutions.
Now I know for a fact as it's been confirmed by others that there is a problem with the monitor database in the fact that it always displays the highest resolution possible. I'm using Nvidia Geforce 6100 and other Nvidia cards. Even in VMware-Server it happens. It won't let me display it in full screen mode because the hardware database sees the maximum resolution of my VMWare display and uses it and my real display can't even go that high. I can't adjust it down to a lower resolution.
I'm using the KDE and the new XFCE versions
2. is about how to edit the grub and what tool to use.