Same problem on my Dell Latitude 7490 with Ubuntu 18.04
kernel 4.15.0-39-generic
kernel: [34885.632118] i2c_hid i2c-ELAN25B6:00: i2c_hid_get_input: incomplete 
report (67/65535)
kernel: [  345.340263] i2c_hid i2c-DELL081C:00: i2c_hid_get_input: incomplete 
report (30/2)

with your kernel 4.15.0-42-generic
no error but the touchpad doesn't work, like if I put acpi_osi= or 
modprobe.blacklist=i2c_hid in GRUB_CMDLINE_LINUX

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https://bugs.launchpad.net/bugs/1784152

Title:
  i2c_hid_get_input floods system logs

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