This bug is reported in launchpad: Elantech touchpad stops working after suspend.
Everytime you wake up from suspending, You have to "unload&load psmouse module manually".
So the solution is create a script.
sudo vim /lib/systemd/system-sleep/trackpoint
with:
#!/bin/sh
case $1/$2 in
pre/*)
echo "Going to $2..."
# Place your pre suspend commands here, or `exit 0` if no pre suspend action required
modprobe -r psmouse
;;
post/*)
echo "Waking up from $2..."
# Place your post suspend (resume) commands here, or `exit 0` if no post suspend action required
sleep 2
modprobe psmouse
;;
esacDon't forget grant excute promission.
sudo chmod +x /lib/systemd/system-sleep/trackpoint
Reboot&Enjoy.
Links:
https://askubuntu.com/questions/671910/touchpad-not-working-after-suspending-laptop
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1490130