Also experienced this bug. The temporary fix (modprobe) worked, but commenting out the "blacklist i2c_i801" line resulted in the machine not finding the touchpad on reboot.
I was able to successfully fix this issue by changing /etc/default/grub as stated in post 43.
Hardware: Thinkpad T440s 15.0-52- generic
OS/Kernel: Kubuntu 18.04/4.
Driver: mtrack
Also experienced this bug. The temporary fix (modprobe) worked, but commenting out the "blacklist i2c_i801" line resulted in the machine not finding the touchpad on reboot.
I was able to successfully fix this issue by changing /etc/default/grub as stated in post 43.