Ok, so it's the i2c support from i2c-designware:

4.12:
P: /devices/pci0000:00/INT33C2:00
E: DEVPATH=/devices/pci0000:00/INT33C2:00
E: ID_VENDOR_FROM_DATABASE=Interphase Corporation
E: MODALIAS=acpi:INT33C2:INT33C2:
E: SUBSYSTEM=platform
E: USEC_INITIALIZED=8027689

4.13-rc1:
P: /devices/pci0000:00/INT33C2:00
E: DEVPATH=/devices/pci0000:00/INT33C2:00
E: DRIVER=i2c_designware
E: ID_VENDOR_FROM_DATABASE=Interphase Corporation
E: MODALIAS=acpi:INT33C2:INT33C2:
E: SUBSYSTEM=platform
E: USEC_INITIALIZED=8644593


Probably all commits for i2c-designware slave adapter support need to be 
backported.

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Title:
  Synaptics touchpad does not work at all

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