L170 supports 1280 x 1024 or not...

I've moved the desktop which was in the study to upstairs, so that Kyoko can use her ThinkPad in the study with her new desk. I kept the old monitor in the study, and when I moved the computer upstairs, I hooked it up with a different monitor, the ThinkVision L170.

It's supposed to support 1280 x 1024 and from what I can tell when booting up Windows, Windows seems to recognize 1280 x 1024. However, the Intel graphics card seems to think that monitor can only support 1024 x 768. Therefore, when trying to configure 1280 x 1024, it then requires me to scroll the screen in order to see 1280 x 1024.

Baffling..! Aggravating!