Juniper networks have vetoed. So the secret is out. JunoOS is actually using IPF.
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vmstat -iuses. The interrupts that it would look at was for the video/keyboard/mouse (console stuff), harddisks, serial ports, and networking. After a preset amount of time, it would shutdown the video, spin down the HDs, etc.... I am not sure about putting the system into suspend and sleep modes, but that's part of the system hardware. I know Microsoft has generic drivers to do this via the ACPI specification. But my method would use software timers in the kernel and not bother with the hardware timers for maximum compatibility. Things like closing the lid of a laptop could put the system into a suspend state.