*** This bug is a duplicate of bug 1786574 ***
https://bugs.launchpad.net/bugs/1786574
I've recently installed Ubuntu 18.04.01 on a Lenovo S540 laptop (full disk
installation).
I have the kernel 4.15.0-43-generic and I had the same problem.
In my /etc/modprobe.d/blacklist.conf there was not module "i2c_i801"
blacklisted, but still the touchpad would be inactive after a wake-up from
suspension and it would come back after a restart.
Adding the parameter "psmouse.synaptics_intertouch=0" to grub solved the
issue.
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https://bugs.launchpad.net/bugs/1788928
Title:
psmouse: after sleep/suspend thinkpad touchpad not functional
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