When the computer enters standby, the 12v line is powered down so your screen will turn off. I believe on the M2 you can get it to get
windows to enter standby within 5 secs of you taking out the key (as you said by simulating a button press), so you should be fine there.
But if your computer fails to enter standby after the "button press" the screen will be on, regardless of whether the key is in the ignition or not. Untill your M2 cuts it off - Which could be anywhere from 1 min to Never depending on the setting of your M2.
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