Hi, yesterday I connected the M2-ATX to my Mother Board, and using the regular PC ATX Power Supply to fake the car battery.
I followed the guidance posted on this thread.
It works very nice! M2-ATX wakes up my CarPC around 5 seconds after the "ignition", and will shutdown or hibernate it 5 seconds after the "ignition" is off. In my test environment the ignition is a switch button (I took the power switch from the old PC case).
I've configured windows to hibernate, Control Panel / Power Options / Advanced / "When I press the power button on my computer" = "Hibernate", so when M2-ATX sends the power-off signal Windows will hibernate instead of shutdown.
This week I will try to power on the Lilliput from the M2-ATX as well. After that I will be ready to try it on the car (real environment).