Tested on ThinkPad X240s:
ThinkPad BIOS GIET52WW (2.00 )
Lenovo ThinkPad X240s, model 3333333

Hang issue is not reproduced.

Loading i2c_i801 runtime  didn't cause any issue.
Booting with touchpad in smbus which using i2c_i801 module, Ubuntu 18.04 works 
fine, touchpad works fine.

Log attached.

Could you provide more details, like dmesg, call trace when system hang?

** Attachment added: "x240s-boot-i2c-rmi.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1802689/+attachment/5221547/+files/x240s-boot-i2c-rmi.log

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https://bugs.launchpad.net/bugs/1802689

Title:
  Upgrade to kmod (25-1ubuntu1.1) causes Lenovo x240 laptop to hang on
  boot

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