Methods, devices, and systems for monitoring the status of a computer through a driverless device node port, such as a universal serial bus port or PS 2 port, are disclosed. A criteria function describing an error between desired color matching functions and a spectral response of an RGB filter set is constructed. The solutions have different densities and therefore separate into different layers. In response to determining that the sleep state timer has less than the threshold time remaining, the processor determines whether the display is being actively viewed by a user-wearable device.