Lenovo ThinkPad X280 User Manual page 61

ThinkPad Basic Docking Station
Up to two external displays connected to the DisplayPort and the VGA connectors can work at the same
time.
ThinkPad Pro Docking Station
Up to two external displays connected to the two DisplayPort connectors can work at the same time.
ThinkPad Ultra Docking Station
• Do not connect multiple external displays to the VGA and DisplayPort connectors at the same time.
Otherwise, only the external display connected to the DisplayPort connector will work.
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Chapter 3 Enhancing your computer