Hi, I'm just chipping in. I have the same system (X1 2nd gen Yoga; 20JD) and the pen exibits the same behavior described in the first post. I can help out with the testing, if you guys need me to. Just a note... By thinking the pen was broken, I bought another one but the problem presisted. Then I installed windows just to see if it's a hardware issue and both pens work just fine there.