weird behaviour @ 800*600 res.

I've got a Radeon X700Pro, running dualhead on it, because i havent got an adapter to have it otherwise, my main display which is a 21" CRT is connected to the DVI , and on the VGA a 19". a very annoying problem i am experiencing with this is that the main screen, when set to 800*600 resolution actually goes 640*480, and when at desktop scrolls to follow the mouse pointer, in games that set to 800*600 with no settings to change available, no scrolling takes place, and what i see is the top left 640*480 of the whole 800*600 picture, extremely annoying.
the problem does not appear on the VGA-connected monitor, but since the 19" has a fixed VGA cable, and it's only the 21" that has a detachable cable, for which i have a VGA replacement, and i want to be able to have the other display connected while gaming to keep check of various stuff, having to detach DVI cable from the main screen, put VGA cable in, detach 19" and attach the main one to the VGA port, and then disabling the DVI output everytime is kind of annoying..
I've experimented with most of the settings for it, but so far come up with nothing to solve it, asking google has also come up empty.
anyone else have/had the same problem and know how to fix this?

I'm submitting this to the ATI support guys too, but i'm getting a feeling that if someone here knows of it, it'll be faster than going the whole way  through the support.

You need a proper driver for the monitor, methinks.

What the fuck. Drivers for a monitor? Oooh, and you should probably install mousepad and speakers drivers too, right?

Fuck this shit. You just set your vertical frequency according to your monitor's horizontal and vertical frequency ranges and you're all set.

>>4
Well, it needs some way to figure out the supported resolutions, no?

>>4
Moron. There are monitor drivers; all they do is just define supported resolutions and other quirky behavior. Modern technology uses a DCC (or some similar acronym - cant recall) channel to automatically learn that info from the monitor.

yeah, the funny thing is that viewsonic are apparently unable to keep the lists of which driver to use with which monitor, and even when having tried all of them, none of them solve the problem X_x

*keep up to date
also, they excercise the "make it as hard as possible for the customer to get in touch with us"-principle, support-phone is only for warranty related stuff, and their "technical contact" gives a 404 -_-