Kubuntu 9.04 - Can't drag application from one screen to another in multi monitor setup

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?

Solution 1:

the reason you can't drag windows from one 'head' onto another 'head' is (as CarlF correctly commented) that your setup is in "separate x display" mode and not in "xinerama mode" (aka "twinview in nvidia-land or "bigdesktop").

such a "separate x display" setup means, that each head can possibly run a completely different configuration regarding visual depth, size, framerate etc. thus, a window created on one head (the term is actually "screen") can not be savely moved onto the other head because the "pixels do not match".

checkout http://ubuntuforums.org/showthread.php?t=221174 and configure your xserver correctly, then your problems will vanish .)