jumpy cursor problem and sugar issue

[Ixo X oxI]

One thing to note also,
   I have observed that many people (including myself) out of habit do a
quick 'double-tap' on the touchpad for a 'left-click' (which is standard for
most US 'typical' laptops).

I've noticed, 8 times out of 10 times touching the keyboard like this, the
cursor and sensitively of the touchpad goes 'wacko' (highly technical term,
I know. More specifically the 'over-sensitivity' issue:).  Especially in the
650 and 653 builds.  However, four-finger-salute touchpad-reset typically
fixes the problem.

Unfortunately, I am currently running latest joyride (now 1914), and the
problem still sporadically happens.

Might want to see if there is a trend on the last thing that the kids do on
the keyboard/touchpad, just before the wild-cursor issues happen.  (i.e.
double-tap, pushing hard, wiped with cloth, spit on keyboard, PB&J, tears of
frustration, broken broccoli, tap with pencil,  spilled lama juice, etc)

One idea of a 'control group', would be have different set/group of kids use
different pointers.. instead of whole finger..... like their fingernail,
hover over pad without touching, different fingers, etc...

Hope that helps,
-iXo

On Sun, Apr 27, 2008 at 7:50 AM, Bryan Berry <bryan.berry at gmail.com> wrote:

> thanks Carol, this instruction for disabling the corner sensitivity is
> extremely useful! I may use it in the custom build I roll out, some 3-4
> months from now.
>
> I hope some of the hardware techs at OLPC like Richard Smith can shed
> some light on the jumpy touchpad. Rebooting works for me as well but it
> really disrupts the learning experience.
>
>
> On Sun, 2008-04-27 at 07:46 -0700, Carol Lerche wrote:
> > The touchpad issues were a problem in NYC as well.  I noticed that it
> > was most problematic with certain kids who were very "touchy"...they
> > seemed to always have their hands fiddling with the touchpad.  Also
> > most common to occur when using paint or colors activity.  Only way I
> > could clear the problem was rebooting -- the 4 finger salute didn't
> > seem to work.
> >
> > On the wiki, this is the instruction for disabling the corner
> > sensitivity to bringing up the frame.  I haven't tested this myself.
> >
> >
> >
> > On Sun, Apr 27, 2008 at 6:39 AM, Arjun Sarwal <arjun at laptop.org>
> > wrote:
> >         Bryan,
> >
> >         Similar issues were dominant at the India pilot too...
> >
> >         On Sun, Apr 27, 2008 at 5:20 PM, Bryan Berry
> >         <bryan.berry at gmail.com> wrote:
> >         > Day 3 of the pilots at Bishwamitra and Bashuki and couple of
> >         issues have
> >         >  come up
> >         >
> >         >  1. We are having a lot of trouble w/ jumpy cursors. You
> >         know where the
> >         >  touchpad behaves erratically. Is there an easy fix to this
> >         problem?
> >         >
> >         >  we are using build 703, MP machines, and firmware Q2d14. We
> >         have the
> >         >  kids hold down the 4 corner buttons as recommended in the
> >         XO user guide
> >         >  but that doesn't seem to consistently fix the problem.
> >         >
> >
> >
> >         I thought there was a fix in Update.1 for the jumpy mouse
> >         bug ?
> >
> >         Other than that, we had observed that the touchpad behaved
> >         differently
> >         because many kids chose to use a larger/smaller area of their
> >         fingers.
> >         Since this is a capacitive touchpad, perhaps that has got
> >         something to
> >         do with the amount of finger area in contact, or the amount of
> >         pressure that one puts (some kids chose to press harder and
> >         harder on
> >         the touchpad when they couldn't seem to get the cursor under
> >         control)
> >         ?
> >
> >         >  Dust is an issue at the schools but that can't explain the
> >         high rate of
> >         >  jumpy cursors. Please assist
> >         >
> >
> >
> >         We didn't find any direct relation with dust as such.
> >         Humidity, and
> >         sweaty fingers, though, did seem to make things consistently
> >         difficult.
> >
> >         >  Suggestions?
> >         >
> >         >  2. For future reference: In general the kids and teachers
> >         find it quite
> >         >  confusing when they move the cursor to the corners of the
> >         screen and the
> >         >  Sugar frame pops up. The kids have learned the top row keys
> >         very quickly
> >         >  - faster than I thought - and they find the frame popping
> >         up quite
> >         >  confusing. They have learned to use the frame button
> >         already.
> >         >
> >         >  pictures to come and a full write-up, I promise!
> >
> >
> >         Looking forward!
> >
> >         Good luck.
> >         Arjun
> >
> >         >
> >         >  Bryan W. Berry
> >         >  Systems Engineer
> >         >  OLE Nepal, http://www.olenepal.org
> >         >
> >         >
> >         >
> >         >  _______________________________________________
> >
> >         >  Devel mailing list
> >         >  Devel at lists.laptop.org
> >         >  http://lists.laptop.org/listinfo/devel
> >         >
> >
> >
> >
> >         --
> >         Arjun Sarwal
> >         Intern, One Laptop per Child
> >         Email: arjun at laptop.org
> >         IRC: arjs on irc.freenode.net in #olpc, #olpc-health, #sugar
> >         Skype: arjunsarwal85
> >         _______________________________________________
> >         Devel mailing list
> >         Devel at lists.laptop.org
> >         http://lists.laptop.org/listinfo/devel
> >
> >
> >
> > --
> > "Always do right," said Mark Twain. "This will gratify some people and
> > astonish the rest."
>
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