I have a new install of Kubuntu 9.04. I installed the ati drivers.
fglrxinfo
display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI FirePro V3750 (FireGL)
OpenGL version string: 2.1.8794 FireGL
When dragging a window from one monitor to the second monitor it stops when the mouse hits the edge of the screen.
Any ideas?