I am able to enable remote desktop in Ubuntu (with Vino), and it works fine as long as the monitor is active. When the KVM controlling the Ubuntu box is switched to a different system, the Remote Desktop session becomes "frozen".
A TightVNC viewer session will connect, and display the Ubuntu desktop. But any attempt to interact with mouse or keyboard is ignored.
How can I enable remote desktop to remain active and usable for a "headless" system, or when the KVM is switched away?