With PC powered off, if I unplug and plug the throttle back in the 5 LEDs flicker once.
If the backlights are ON when I shut down and restart they turn OFF as soon as the PC posts. They turn back on when my other USB devices light up, just after the "Starting Windows" animation finishes.
Sleep mode and shutting down does nothing, the backlight stays on till I unplug the USB cable or post again. This happens with both the front and rear (direct onboard) USB ports.
Drivers, TARGET and Firmware all updated: