Comment 23 for bug 1526393

Further updates!

I can't seem to figure out when the trackpad will and will not be detected, but I found http://askubuntu.com/questions/636350/elantech-touchpad-not-detected-anymore-on-ubuntu-15 which describes an issue with similar hardware, and sure enough adding `i8042.kbdreset=1` to `GRUB_CMDLINE_LINUX_DEFAULT` in /etc/default/grub seems to have things working for now!

Which means I've progressed from "my trackpad is working and I don't know why" to "my trackpad is working and I mostly know why", a huge improvement! :)