How does automatic video detection work?

It used to be that, on my T400, when I would plug in an external monitor, the external would mirror that of my laptop. When I closed my laptop, the screen would automatically calibrate for the external monitor's resolution. And so on. I recently installed catalyst 9.8, and since then, the automatic switching no longer happens. I really have no idea how to go about re-enabling that automatic display detection that seemed to be happening earlier. I'd love to hear any ideas! thanks.

I suppose I could, but I'd prefer to at least have a working hypothesis first before changing things around.  Noone out there knows how this auto vid detection works?

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