Lenovo 250610U - Thinkpad X4 Ultrabase User Manual page 18

2. Make sure the security lock key of the X4 Dock is in place and in the
unlocked (vertical) position.
3. Close the computer display.
4. Press the eject request button. The Docked indicator starts blinking, then
turns off.
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ThinkPad X4 Dock User's Guide