Comment 4 for bug 49188

June 12,06: Problem solved.

At the risk of being boring, I am coming back to the subject hoping that it may help other people with the same problem.
My bug report is a duplicate of bug #31830, apparently.
And the solution was a result of the tip below, posted by Ricardo Perez Lopez,whom I would like to thank.

May I quote you Ricardo?
Here it is:
"If I do "sudo dpkg-reconfigure xserver-xorg", and follow the steps, I finally have a configuration that works perfectly, with 1024x768, 800x600 and 640x480 resolutions available. I attach the xorg.conf file generated by the "dpkg-reconfigure" execution"

Well, I did follow this tip, and I did get the desired resolutions (1024x768, 800x600, and 640x480).
As a matter of fact, I even have the correct size of my monitor screen which was smaller by about two centimeters all around before.
    Thank you Ricardo. Good work!