I can confirm this issue on my Asus K501LX-NH52 on a fresh install
(Xubuntu 14.04.3) from yesterday. Touchpad stops working after suspend,
forced to use USB mouse for now.

The Elantech driver is installed automatically when Ubuntu installs.
Kernel 3.19.0-37 is installed as part of the first batch of updates.
I tried installing Pilot6's  ppa:hanipouspilot/focaltech-dkms driver without 
any change.


dmidecode | grep Product\ Name
        Product Name: K501LX

uname -r
3.19.0-37-generic

dkms_status output:
bbswitch, 0.7, 3.19.0-37-generic, x86_64: installed
focaltech, 1.5~trusty1, 3.19.0-37-generic, x86_64: installed
nvidia-355, 355.11, 3.19.0-37-generic, x86_64: installed

lsmod | grep i8042
<no output>

I guess I'll try this kernel patch as suggested for now, while this
issue is still pending.

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https://bugs.launchpad.net/bugs/1504445

Title:
   FocalTech touchpad stops working after suspend

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