Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.16 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:

Once testing of the upstream kernel is complete, please mark this bug as

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.17-rc1/

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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  'SynPS/2 Synaptics TouchPad' doesn't work 'Lenovo Thinkpad T440p'
  after the kernel upgrade

Status in linux package in Ubuntu:

Bug description:
  Hi all,

  I have been using Xubuntu 16.04 since June 2016 on my Lenovo Thinkpad
  T440p (i5-4210M, 16GB RAM, NVIDIA 730M). However since last year
  (probably after a kernel upgrade), my touchpad has stopped working (I
  always keep the system upgraded via apt update/upgrade. It doesn't
  work at all, and I have to use an external mouse.

  Only very rarely, it somehow works as well (by rare I mean twice in
  the last two years), but as soon as I reboot, the state is back to
  non-working at all. Additionally, even when working in those two rare
  occasions, the touchpad behaved erratically, i.e., the tap click was
  not working and the pointer was kind of jumpy.

  As per the description at
  https://wiki.ubuntu.com/DebuggingTouchpadDetection, I attach an
  archive touchpad_debug.tar.gz containing two sub-folders working_state
  and nonworking_state. Each folder contains the dmesg output, my
  /proc/bus/input/devices, and my /var/log/Xorg.0.log when the touchpad
  was working and not working. In working_state, I additionally have the
  outputs to "xmodmap -pp", "xinput --list ", and "xinput --list-props


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