Hey folks, Here's what I did to get 1440x900 full-screen resolution working with a Linux guest OS (CentOS 5, to be exact). I manually edited the xorg.conf file, and added the following Modeline to the Monitor section: Modeline "1440x900" 108.84 1440 1472 1880 1912 900 918 927 946 Then in each "Display" subsection of the "Screen" subsection, I added "1440x900" (including the quotes) to the list of resolutions on the "Modes" line. I put it first. Things worked like a charm after that! I have attached the entire xorg.conf file to this post for you. Just use it to replace /etc/X11/xorg.conf (though I would back up your old one just to be safe).