After upgrading my Asus zenbook UX305FA from Ubuntu 15.04 to 16.04, one feature of the touchpad no longer worked: triple-tap to select a word, and then drag to extend the selection to multiple words. In 16.04, the initial word is selected, but the selection is not extended by the drag.
I traced back this difference to the following git commit:
Author: Gabriele Mazzotta <firstname.lastname@example.org>
Date: Thu Jan 15 22:04:17 2015 +0100
In addition, decrease the default value of MaxDoubleTapTime from 180 ms
to 100 ms in order to make double taps faster.
Indeed, after reseting MaxDoubleTapTime back to 180, everything works as before. It seems that his value needs to be at least 160 to work reliably.
I honestly can't remember exactly why I wanted to lower the timeout, I think that that commit increased the time required to complete double taps and I wanted to balance the increase with a lower timeout.
I can still do the triple-tap and drag thing, but I have to say it's harder now. To be honest, 180ms seems fine now and I guess it's better to revert to that value.
Author: Peter Hutterer <email@example.com>
Date: Fri Apr 29 10:51:17 2016 +1000
Revert MaxDoubleTapTime back to 180