Comment 12 for bug 868400

While this becomes 'random' after install it almost always happens right after, here typically when setting wireless password.
So did a fresh install with todays daily
Attached is evtest log after/while touchpad stopped working

What also restores the touchpad here is this, no logout required -
synclient Touchpadoff=0
It may be easier to test anything from a new install rather than waiting for it to occur or not occur later - though at least here disabling the above mentioned option seems to prevent
(& or enabling the option instead thru syncdaemon as mentioned in my dupe