Lenovo ThinkPad T540p - Manual (Page 119)

For the ThinkPad Ultra Dock, if you connect two displays to the DisplayPort connector and the HDMI
connector, the HDMI connector is inactive.
Security features
The system lock key has two positions as shown in the drawing.
The security feature is different when the key is in different positions:
• When the key is in the locked position (position 1), the eject button of the docking station is locked, and
you cannot remove your computer. The key lock indicator is on when the eject button is locked.
• When the key is in the unlocked position (position 2), the eject button of the docking station is unlocked,
and you can remove your computer. The key lock indicator is off when the eject button is unlocked.
Chapter 7 . Enhancing your computer 103