KNX works without the computer. What does not work without the computer is specific additional logic, especially time logic, which I CAN live without. Every room has a simple 4-button sensor which controls basic lighting and blinds. All bigger logic, like grouping and stuff, timed events etc, are controlled by LinuxMCE. So, if the computer fails, the people in the house are still able to use all the stuff in the house, just not as comfortable as before.