Hi guys, I also suffer from this problem on my X1 6th gen on Ubuntu as
well as Fedora.

Looks like there was a change made in Kernel 5.5 addressing the issue (see the 
last sentence in the commit message, "With this change I can read out the 
touchpad data correctly on my
Lenovo X1 Carbon 6th Gen laptop"):
https://github.com/torvalds/linux/commit/a284e11c371e446371675668d8c8120a27227339#diff-02afb07ddbb5e9cae9b7709130f6ec26

Generally speaking, there are a lot of changes in the rmi4 driver since
April 2019 or Kernel 5.1 (see
https://github.com/torvalds/linux/commits/master/drivers/input/rmi4).
Unfortunately I'm still having this problem on Kernel 5.3 so I was
hoping 5.4 would improve the situation. I guess we'll have to try 5.5
then!

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https://bugs.launchpad.net/bugs/1791427

Title:
  Touchpad and/or trackpoint stop working after S3 suspend on Lenovo X1
  Carbon 6th

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