I am setting up a new office for our President/CEO. He will be using his Lenovo ThinkPad T480s with the Lenovo ThinkPad Ultra Docking Station and three Lenovo P24q monitors. The dock has 2 DisplayPort 1.4 ports and 1 HDMI 2.0 port. The monitors all have mini-DP, DP and HDMI.
When we connect from the dock to the monitors via two DP and one HDMI, two of the monitors work at the full recommended 2560x1440 but the 3rd only uses 1920x1200. I tried two different hubs - a DP > 3 HDMI and DP > 3 DP - to see if that would resolve but I got the same results.
It has been a long time since I've messed around with more than 2 displays - especially when using a laptop. What am I doing wrong here?