I have problem with X configuration I really can't fight.
I have GeForce2 MX400 (32 Mb), Flatron 775FT monitor, latest Detonator (in Windows) and latest Nvidia drivers (in Linux). I set the same resolution and refresh rate (in Linux I set my monitor's vertical and horizontal frequencies according to data sheet as you cannot insert refresh rate directly) in Windows and in Linux(1024x768).
And screen area in Slack is for any reason lower then in Windows!!!
There is black frame around the screen. I tried to fix it with xvidtune, but it was impossible to extend the display area to cover whole screen (regulation stopped at some size and didn't want to go further).
I don't want to use "hard" buttons in front of my monitor to extend the picture, as it would spoil display in Windows. I use both systems and it would be very annoying to change these settings every time I switch systems.
Maybe there is a way to extend my display in Linux?
Does anybody experienced the same problem?
Any help would be appreciated.

OK, done. By changing horizontal frequency in XF86Config (to lower than given in monitor data sheet).
Bug in X, or perhaps LG monitors are not the best in whole universe.

If I remember correctly, I believe that the black box around the screen is either caused by a failing monitor or you need to adjust something with the monitor. It can also occur in LCD monitors is the resolution is too low for the monitor, so the image isn't big enough to go all the way around. Try a higher resolution, maybe?