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

Status in kmod package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Incomplete
Status in kmod source package in Xenial:
  Fix Committed
Status in linux source package in Xenial:
  Incomplete
Status in kmod source package in Bionic:
  Fix Committed
Status in linux source package in Bionic:
  Incomplete
Status in kmod source package in Cosmic:
  Fix Committed
Status in linux source package in Cosmic:
  Incomplete

Bug description:
  After upgrading my Lenovo x240 laptop to kmod (25-1ubuntu1.1), it
  hangs on boot.

  After blacklisting i2c_i801 everything works great again.

  I realize that this was a fix for bug 1786574, and that helps some
  other folks out.  I'm not sure what the right fix is but there's got
  to be something that works for everyone.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/kmod/+bug/1802689/+subscriptions

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