OK, I think I am beginning to get the picture. At the time one plugs it into the USB socket, for this particular device, one should be sure to have a keyboard also plugged into it, if one wants to use the mouse. (But at least in my later tests, if didn't disable the laptop's own keyboard. Hmmm.) I.e., both PS/2 sockets need to have something plugged into them. I'm not sure if it is the devices' fault, or Linux's. I'm willing to do any tests as instructed though.
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