Your monitor should have several buttons on the bottom border or side border:
If you have a button like number 1 in the screenshot above, press and hold for 10 seconds to enable or disable DDC/CI:
For more information, see your ThinkVision User Guide. The User Guide for the ThinkVision 2054PC is here (https://cc.cnetcontent.com/inlinecontent/mediaserver/test/7f4/a3e/7f4a3ed51bbd48afb6a49839c2acfc47/original.pdf) and the relevant information starts on page 17.
If enabling (or disabling, if already enabled) DDC/CI doesn't stop the message from appearing, ask Lenovo for help: