Took me a while to find out that just because my Thinkpad Notebook supports DisplayPort 1.2 and has Thunderbolt, it does not mean I can actually use the specified resolutions with the Thinkpad USB-C Dock Gen 2.
I don't know if you have every used 30Hz with a mouse, but it sucks. Especially when you are used to 120Hz... Now I am looking for a Dock that actually supports 4k60Hz with DisplayPort 1.2.
For reference, DisplayPort 1.2 supports 4k60Hz according to Wikipedia: https://en.wikipedia.org/wiki/DisplayPort#Refresh_frequency_...
But when I look into the User Guide of the ThinkPad USB-C Dock Gen 2, the max resolution for DisplayPort 1.2 is 4k30Hz (Page 7): https://download.lenovo.com/consumer/options/thinkpad_usb-c_...
I don't know if you have every used 30Hz with a mouse, but it sucks. Especially when you are used to 120Hz... Now I am looking for a Dock that actually supports 4k60Hz with DisplayPort 1.2.