I may have found a somewhat acceptable workaround.

I have discovered that the above mentioned behaviour also occurs with a
successful suspend

So the workaround is:

Boot up -> suspend -> force shutdown(hold power button) while suspended
-> reboot

Then the touchpad should be working. 
I am still trying to figure out why this is happening.
https://bbs.archlinux.org/viewtopic.php?id=252711
This is a thread with recent activity about something similar. 
Maybe it can be of use to someone.

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https://bugs.launchpad.net/bugs/1912880

Title:
  Touchpad (MSFT) not detected on Lenovo Ideapad Flex 5 AMD

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