An interesting observation: I've nuked my installation again with a new
Ubuntu install (I've also updated the BIOS and brought back factory
settings - I just enabled S3, disabled secure boot and turned
Thunderbolt support). A fresh install (WITHOUT ANY UPDATES) detects the
touchpad as SynPS/2 Touchpad. As long as it stays like this, S3 and
resume work fine, without issues. When I do apt update and upgrade,
after restart the touchpad is detected as Synaptics Touchpad (so a bit
different than before), it starts acting weird again after resume. Does
anyone know a way to enforce this PS/2 mode?

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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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