In the case of the 2015-vintage Wacom Cintiq Companion 2, this turns out to be the so-called Athena chip, which switches the display input between the HDMI port and internal display controller.
“The Wacom Movink isn't for everyone. But if you are its target audience, it's a wonderful and powerful slate.” Accessorizing the kit is a pricey adventure Could’ve used a magnetic pen latch ...