I've got a NVidia GTX260 card with one regular screen above one touchscreen using the eGalax driver.
I've tried to configure the touchscreen using xinput but I can't get it right. With the normal screen disconnected and fiddling with the "Evdev Axis Calibration" option it works fine, but when I hook up the normal screen again the tough mapping is shifted. If I touch the touchscreen the mouse moves to the corresponding position on the other screen.
Neither "Coordinate Transformation Matrix" nor "map-to-output" seems to work...
Any help is greatly appreciated!