I have a new Dell Lattitude E6540 connected via HDMI to an Asus VH236HL. In both cases, the native resolution is 1920x1080, however the Dell has a 15.6" screen and the Asus has a 23" screen. As a result, if you drag any windows or content from the Dell to the Asus, there is a very conspicuous magnification effect.
Is there any way to eliminate this magnification jump between monitors?