Touch pads

Ben Wiley Sittler bsittler at
Tue Nov 25 17:53:51 EST 2008

not sure whether this is the same bug/limitation, but i have noticed
the touchpad goes haywire when my daughter uses it with a bit of food
on her fingers (obviously i try to avoid letting this happen, but
sometimes it does anyhow...)

i just tried to simulate this.

as a test i used an eyedropper to put 0.5ml of tapwater onto the
touchpad. suddenly the entire vertical strip of trackpad containing
the droplet becomes nonresponsive, but the rest of the trackpad works
still. when i drag my finger through the droplet to remove it from the
trackpad, leving my finger a bit wet and "tacky", the trackpad
subsequently feels very jumpy. once i dry off my finger, though, it
works fine.

i don't have instruments here, but a local weather site says:

 59.8 °F  / 15.4 °C
Humidity: 	75%
Dew Point: 	52 °F / 11 °C

On Tue, Nov 25, 2008 at 2:42 PM, Martin Langhoff
<martin.langhoff at> wrote:
> On Tue, Nov 25, 2008 at 8:11 PM,  <david at> wrote:
>> the problem is that if tqwheeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeejkweey can't duplicate the problem they can't fix it
>> (they can change things, but they have no way of knowing if it fixes the
>> problem or not)
> Well, right now I'm in a rather hot and humid location (Buenos Aires,
> Argentina), and will be here for 1 month, working. What things can I
> do to replicate it?
>  Let the machine get very warm?
>  Get very sweaty hands?
>  This place is not dusty - not sure what would help this
>  Are kids hands more likely to trigger it than adult hands? I have a 4
> year-old that can help us.
>  Does being grounded vs wearing rubber soled shoes make a difference?
> To Richard:
>  What logs should I capture? Things to try?
>>> I somehow
>>> got the notion that models from the future would be helped with this
>>> defect somehow, but apparently that's not the case.
> Well, there *is* a new touchpad model in the works, I'm not sure
> exactly when it enters production.
> cheers,
> m
> --
>  martin.langhoff at
>  martin at -- School Server Architect
>  - ask interesting questions
>  - don't get distracted with shiny stuff  - working code first
>  -
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