A human machine interface (HMI) system controls operation of a graphical user interface (GUI) being displayed on a display located in a vehicle. The HMI system includes an interface device, an interface operation module, and a device selection module. The interface device is operable to control the GUI and includes a knob member and a touchpad. The interface operation module receives input data from the interface device in response to an operation of the interface device. The device selection module designates at least one of the knob member or the touchpad as an active device based on a device selection criteria. The interface operation module transmits data from an active device to a display module controlling the GUI and disregards data from an inactive device.