Configure touchpad double-tap

Nio Wiklund nio.wiklund at
Fri Feb 28 06:06:13 UTC 2014

2014-02-28 02:10, John Hupp skrev:
> On 2/26/2014 6:41 PM, John Hupp wrote:
>> On 2/25/2014 7:00 PM, John Hupp wrote:
>>> On 2/22/2014 8:24 PM, John Hupp wrote:
>>>> 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
>>>> 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!
>>> I know more now but still don't have a resolution.
>>> Documentation of the settings reported and governed per-session by
>>> synclient are at
>>> FingerLow and FingerHigh are the settings that should govern
>>> sensitivity, if that is my issue.
>>> Default settings are automatically configured by Xorg, but may be
>>> temporarily changed during a session via synclient.  Make permanent
>>> changes by editing /usr/share/X11/xorg.conf.d/50-synaptics.conf and
>>> adding Options to the existing InputClass section that has the
>>> Identifier "touchpad catchall."  An example with Options for
>>> FingerLow and FingerHigh:
>>> Section "InputClass"
>>>     Identifier "touchpad catchall"
>>>     Driver "synaptics"
>>>     MatchIsTouchpad "on"
>>>     MatchDevicePath "/dev/input/event*"
>>>     Option "FingerLow" "10"
>>>     Option "FingerHigh" "16"
>>> EndSection
>>> This laptop is dual-booting Saucy with Windows Vista, and so far I
>>> have not been able to configure the touchpad so that it double-taps
>>> easily and consistently/reliably the way it does in Windows.  (Which
>>> is also to say that I know that the touchpad hardware is OK because
>>> it works fine in Windows.)
>> I booted into the *Ubuntu* Live DVD on this laptop, and touchpad
>> double-tapping performed very smoothly.
>> Under Ubuntu, synclient reported different values for VertEdgeScroll
>> and HorizTwoFingerScroll than Lubuntu reported, but changing those
>> settings to match in Lubuntu did not help the double-tap problem.
>> I installed Lubuntu Saucy on another laptop, and double-tap worked
>> beautifully on that machine, but it has an Alps touchpad rather than
>> Synaptics.
>> I booted into the Lubuntu Trusty 2/14 Daily Build Live DVD on the
>> problem laptop and found that it had the same problem with double-tap,
>> but while there I discovered that a *TRIPLE-TAP* reliably yielded the
>> behavior expected for a double-tap.
>> So I booted back into Saucy from the hard drive, and found that there
>> too, a triple-tap reliably yielded the behavior wanted for a double-tap.
>> It seems like this information could be used to alter the settings to
>> get expected behavior from a double-tap, but I'm not sure how.
>> Does this tell anyone something?
> It seems to me like this behavior is a bug, probably related to Xorg, or
> more likely LXDE since it does not occur under Ubuntu.
> I like the idea that Trusty is a bug-fix-oriented release, and I'd like
> to see what I can do to help get this fixed for Trusty as well as Saucy.
> I've been reading and linked
> docs.  It seems like I would be required to join a QA team in order to
> do anything (e.g. access the QA mail list), even if my focus were fixing
> one problem.  Then I read about laptop testing, and it seemed that one
> would have to join a laptop testing team that was Ubuntu-oriented rather
> than focused on Lubuntu, and the job description also seems focused on
> execution of prescribed test cases.
> I should say that I also have an interest in certain other bug-fixes for
> Trusty -- most of them for the desktop -- but admitting my immediate
> interest in this specific laptop problem, does anyone have advice on how
> to proceed?
> One late, parting thought: Instead of joining a QA team, etc., can I
> file a standard bug report at Launchpad for issues with Trusty?
Hi John,

Yes. There are many ways to go. You can certainly file standard bug
reports at Launchpad for issues with Trusty. You can also add test
reports for the next version (now Trusty) at the testing tracker

I think it is hard to get a dialogue with the developers, but you can at
least get a one-way communication (telling them the problems).

Best regards

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