Looks like i2c-hid wasn't loaded for Elan.
Can you try latest mainline kernel here: 
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.12-rc1/
And boot with `i2c-hid.dyndbg=+p' to kernel parameter.
Attach `dmesg` afterward.

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https://bugs.launchpad.net/bugs/1658345

Title:
  Touchpad not recognized on Lenovo Ideapad Flex 4 running Ubuntu 16.10

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