Yeah, that is one explanation. But the magewell products are expensive and there have good linux support (only reason why I picked them), which is usually not f

Yeah, that is one explanation. But the magewell products are expensive and there have good linux support (only reason why I picked them), which is usually not found in cheap chinese products (even if I know magewell is chinese). I thought a bit more about it, and it seems they have have carefully selected an A type connector, in the documentation, they state we should not use an other cable. Maybe they have some electronic in their cable and used the A-A trick to prevent users from using another cable. I could take the cable to the electronic lab to have it tested, but sadly I don't have spare lying around and the devices are all in use.