Ubuntu 18.10 (Cosmic Cuttlefish) has reached end of life, so this bug
will not be fixed for that specific release.

** Changed in: linux (Ubuntu Cosmic)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1778534

Title:
  Touchpad not working (Elantech ELAN0618)

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Xenial:
  Triaged
Status in linux source package in Bionic:
  Triaged
Status in linux source package in Cosmic:
  Won't Fix

Bug description:
  For a fresh installed Ubuntu 16 (and 18), touchpad doesn't work for
  Elantech ELAN0618.

  We have modified the struct elan_acpi_id, by adding ELAN0618 to the
  list of the supported models (in the file
  drivers/input/mouse/elan_i2c_core.c from the kernel source)

  static const struct acpi_device_id elan_acpi_id[] = {
        { "ELAN0000", 0 },
        { "ELAN0100", 0 },
        { "ELAN0600", 0 },
        { "ELAN0602", 0 },
        { "ELAN0605", 0 },
        { "ELAN0608", 0 },
        { "ELAN0605", 0 },
        { "ELAN0609", 0 },
        { "ELAN060B", 0 },
        { "ELAN060C", 0 },
        { "ELAN0611", 0 },
        { "ELAN0618", 0 },
        { "ELAN1000", 0 },
        { }
  };

  and then built the kernel, and our problem solved.

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