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Default USB always on

I have an Acer E15 E5 laptop two usb3 ports and one usb2, and when I
plug a flashdrive into one of the USB3 (but not the other ports) it
lights up even when the computer is off, and when it's not plugged in.
What's with that?

I've never seen this mentioned in a spec. Is it about waking up the
laptop? (Will this be true on my desktop too?) I've heard of wake-up on
LAN and iirc wake-up on phone (???), but not wake-up on USB.
 
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