Configure touchpad double-tap

[John Hupp]

On 2/20/2014 12:07 PM, John Hupp wrote:
> On 2/20/2014 3:05 AM, Ali Linx wrote:
>>
>> On 02/20/2014 05:26 AM, John Hupp wrote:
>>> I just installed Lubuntu Saucy on a Lenovo 3000 laptop and I'm 
>>> finding that touchpad double-tap does not seem to work (Synaptics 
>>> touchpad).
>>>
>>> I've seen a few other complaints on related topics but haven't found 
>>> anything that really defines what can be configured on touchpads and 
>>> how.
>>>
>>> Options?
>>>
>> Hi,
>>
>> AskUbuntu? Ubuntu Forums?
>> Try :)
>>
>
> I could have added that one of the posts I saw said that double-tap 
> worked fine in Ubuntu, but not in Lubuntu.
>
> So it would seem that this list ought to be a good place to bring this 
> up.
>
>

After further playing around, it seemed that double-tap was not 
disabled, but required *VERY* fast tapping.

I found synclient, which is installed in Lubuntu Saucy and supposed to 
control Synaptics touchpad behavior, with documentation at 
http://manpages.ubuntu.com/manpages/saucy/man1/synclient.1.html

That documentation indicates that the related config file is at 
/etc/X11/xorg.conf, but that doesn't exist on my machine, so at the 
moment I don't know what the universal/user configuration locations are.

synclient -l reports MaxDoubleTapTime=180 initially, and it allowed me 
to set 'synclient MaxDoubleTapTime=360.'  I'm guessing that it could 
probably be set as high as 1000.

This seemed to help, but double-tap is still unreliable: sometimes it 
seems to require unreasonably forceful tapping.

synclient also reports settings for:
     PressureMotionMinZ
     PressureMotionMaxZ
     PressureMotionMinFactor
     PressureMotionMaxFactor
But it is not self-evident to me what behaviors those settings are 
supposed to govern and if any of them would set the touchpad to respond 
to a lighter touch.

I have not yet found any better documentation, and maybe that would help 
me achieve better control.  So I'm still open to further help!