Public bug reported:

This is on an ASUS GL503VD laptop and would probably affect other ASUS
laptops equipped with the ELAN1200 touchpad.

I am on Kernel 4.17.2 because older kernels did not enable the touchpad
at all(It was just unrecognized or i2c-hid stopped the computer from
booting)

The touchpad works but it has erratic behaviour and disconnects
randomly. After it disconnects the only way to bring it back is to
`modprobe -r hid-multitouch && modprobe hid-multitouch`

Libinput and synaptics can handle the touchpad though I found synaptics
to be more stable.

dmesg gets spammed with this whenever I move the touchpad:
[timestamp] i2c_hid i2c-ELAN1200:00: i2c_hid_get_input: incomplete report 
(16/65535)

I tried to compile: https://github.com/mishurov/linux_elan1200_touchpad
Because from what I understand the "jumpy/disconnect" problem is associated to 
the incomplete reports and Mishurov managed to mitigate those. Unfortunately 
some symbols were deprecated in kernel 4.17.2 and it did not compile for my 
system.

While I can use my touchpad as is right now, and "restart" it with
modprobe when needed, it would be nice to have it function bug-free.
(Right after I typed this my touchpad disconnected and I needed to
modprobe again, I am considering making a cronjob for that)

Let me know if anything else is needed. Will wait for an apport
collection to add log files.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1778087

Title:
  ELAN1200 touchpad jumps around and disconnects

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This is on an ASUS GL503VD laptop and would probably affect other ASUS
  laptops equipped with the ELAN1200 touchpad.

  I am on Kernel 4.17.2 because older kernels did not enable the
  touchpad at all(It was just unrecognized or i2c-hid stopped the
  computer from booting)

  The touchpad works but it has erratic behaviour and disconnects
  randomly. After it disconnects the only way to bring it back is to
  `modprobe -r hid-multitouch && modprobe hid-multitouch`

  Libinput and synaptics can handle the touchpad though I found
  synaptics to be more stable.

  dmesg gets spammed with this whenever I move the touchpad:
  [timestamp] i2c_hid i2c-ELAN1200:00: i2c_hid_get_input: incomplete report 
(16/65535)

  I tried to compile: https://github.com/mishurov/linux_elan1200_touchpad
  Because from what I understand the "jumpy/disconnect" problem is associated 
to the incomplete reports and Mishurov managed to mitigate those. Unfortunately 
some symbols were deprecated in kernel 4.17.2 and it did not compile for my 
system.

  While I can use my touchpad as is right now, and "restart" it with
  modprobe when needed, it would be nice to have it function bug-free.
  (Right after I typed this my touchpad disconnected and I needed to
  modprobe again, I am considering making a cronjob for that)

  Let me know if anything else is needed. Will wait for an apport
  collection to add log files.

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