Absolute vs. Relative Mouse

There are circumstances where the hardware KVM cannot synchronize the sent mouse cursor position with the display application. This does not occur with operating system drivers, but it can happen with a DOS or BIOS display, or an application such as the Norton* Ghost backup utility, all of which depend on relative mouse position inputs. The result is that the mouse position on the KVM viewer begins to diverge from the image of the mouse cursor returned from the remote platform. This problem can be made worse if the IT operator moves the mouse off of the viewer display from one side and reenters the display from another side or when a remote user moves a mouse.

If the remote application does not support absolute mouse positions, the RealVNC Viewer GUI supports a “Relative Pointer Motion” option. By selecting this option, the Viewer starts to send relative mouse events so that Intel AMT does not have to convert from absolute to relative. In this mode the Viewer does not display the local mouse at all and does not allow the local mouse to exit the Viewer window frame, so the synchronization problem is eliminated. Enable or disable the “Relative Pointer Motion” mode using the RealVNC viewer menu that pops up after pressing F8 (the default escape key).

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