[Bug 1784146] [NEW] i2c_hid_get_input floods system logs

[Romano]

Public bug reported:

Ubuntu 18.04.1 LTS
Release: 18.04

After upgrading to kernel version 4.15.0-29 from 4.15.0-23, the system
logs are flooded whenever I move the cursor with my touchpad.

It looks like this:
i2c_hid i2c-ELAN1010:00: i2c_hid_get_input: incomplete report (14/65535)
i2c_hid i2c-ELAN1010:00: i2c_hid_get_input: incomplete report (14/65535)
i2c_hid i2c-ELAN1010:00: i2c_hid_get_input: incomplete report (14/65535)
i2c_hid i2c-ELAN1010:00: i2c_hid_get_input: incomplete report (14/65535)
etc...

This problem did not occur on the previous kernel version so there must
have been a change to the "drivers/hid/i2c-hid/i2c-hid.c" file. This
seems to be fixed in a recent commit here:
https://github.com/torvalds/linux/commit/ef6eaf27274c0351f7059163918f3795da13199c

I am currently running the older kernel version but would still like to
be up to date without this flooding happening.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: driver i2c-hid kernel-bug touchpad

** Attachment added: "Screenshot of the system logs"
   https://bugs.launchpad.net/bugs/1784146/+attachment/5168962/+files/zlbha5edwnc11.png

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https://bugs.launchpad.net/bugs/1784146

Title:
  i2c_hid_get_input floods system logs

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Ubuntu 18.04.1 LTS
  Release: 18.04

  After upgrading to kernel version 4.15.0-29 from 4.15.0-23, the system
  logs are flooded whenever I move the cursor with my touchpad.

  It looks like this:
  i2c_hid i2c-ELAN1010:00: i2c_hid_get_input: incomplete report (14/65535)
  i2c_hid i2c-ELAN1010:00: i2c_hid_get_input: incomplete report (14/65535)
  i2c_hid i2c-ELAN1010:00: i2c_hid_get_input: incomplete report (14/65535)
  i2c_hid i2c-ELAN1010:00: i2c_hid_get_input: incomplete report (14/65535)
  etc...

  This problem did not occur on the previous kernel version so there
  must have been a change to the "drivers/hid/i2c-hid/i2c-hid.c" file.
  This seems to be fixed in a recent commit here:
  https://github.com/torvalds/linux/commit/ef6eaf27274c0351f7059163918f3795da13199c

  I am currently running the older kernel version but would still like
  to be up to date without this flooding happening.

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