Hi there! Created an account on this site just to answer this post. Can confirm, my Lenovo c940 14 inch UHD does this same creaking sound, but not as drastic to the hinge as in the video. Mine does it when converting it to tablet or tent mode by holding it by one of the edges give it a flip. The chasis is the one making the noise more than the hinge, since everytime I hold it up in one hand it makes the sound. Something is definitely not glued inside there well.
And to add, this is my second Lenovo c940 I have, since my first one had incredibly slow recharge speed (3 hours to max charge it) and suddenly it didn't want to wake from sleep unless I restarted it. Going to go soon to Best Buy and have it changed yet again because my old made absolutely 0 creaking sounds at all, and to get a replacement laptop more faulty than the original is just a no deal for me.
