These messages come from the i2c_hid module, which is a module that sits
between the hid-aus driver and the i2c driver. The message indicates
that the i2c_hid module received an invalid INPUT report and has
discarded it. The hid-asus driver is never made aware that this
occurred.

I can think of three possible causes:
a) an electronic signalling issue;
b) a firmware issue; or
c) a proprietary function of the device

There's little that can be done for a) or b) - it's effectively faulty
(or poorly shielded) hardware. For c) - if there were documentation we
might be able to do something. But it would likely require a quirk at
the lower levels (i.e. the i2c_hid module). And given (in my experience)
the minimal impact of these messages - that might be something the
kernel maintainers would consider undesirable.

You could investigate further by modifying the i2c_hid module to dump
the contents of the discarded message. But since a recent change to the
i2c_hid module (which put a sleep inbetween the POWER ON and RESET
commands) I no longer seem to get these messages.

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https://bugs.launchpad.net/bugs/1650895

Title:
  Several new Asus laptops are missing touchpad support

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