As of my Lenovo X380 yoga and HP Spectre 2020 model : - via DisplayPort works - via HDMI only works distorted (set 1:1). Since it only has 1 display port cable, I can't switch. Which would be necessary for testing... Who can help me? Behind the HP is another Thunderbolt 3 dock with HDMI. Doesn't work without and no longer(!?) with the USB-C to HDMI cable.