> In theory we could have a popup box that tells you that both your computer and other device support higher speeds/more power, but your cable is limiting it.
I'm pretty sure my old Dell XPS laptop with Windows 10 had pop-ups just like this.
"This device can run faster" or something.
I wonder if it's possible for a regular machine with two high speed ports to do a cable test by itself. Maybe it can't test all the attributes but could it at least verify speed claims in software?
Even Apple now has one of those, when you plug something into the USB 2 port on the MacBook Neo.
I strongly suspected my old xps had nonstandard things going on with its USB C charger
AFAIK that's just when plugging in a USB 3 device into a USB 2 port or using a USB 2 cable.