My cheap-ish Samsung (cheap for a QHD) has an HDMI and a DisplayPort input. If I hook up a laptop to each input, both laptops think the screen is on- even the one who is not currently being displayed.
So you all know the usual UI for chaning the input source – up in the menubar, or a keyboard shortcut. But since I don't know when a weird orange (my set accent colour) blob appears seemingly randomly ...
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