[Olpc-open] jumpy cursor problem and sugar issue

[Steve Holton]

Do you have a way to accurately measure relative humidity?

I saw pretty severe trackpad issues on one of my XO's on a single day and
haven't seen a re-occurrence yet.
At the time, it looked clearly related to static fields.

On the other hand, I have seen (and fixed) a very similar behavior on a
NintendoDS touchpad which was caused by dust or sand becoming trapped under
the frame along one edge.


Just a theory (I have no data to indicate this works) but when you see the
touchpad problem on an XO could you try this and report back with
success/failure/experiences:

On an XO showing jumpy trackpad problems:

   1. Raise the screen to full vertical / perpendicular.
   2. Rotate the screen 1/8 turn clockwise (reverse this for left-handers)
   3. With the right hand palm facing up, reach under the screen and put a
   finger on the metal mounting bracket or screw of the swivel hinge.
   4. With the finger still in contact with that (essentially a chassis
   ground), lightly brush the trackpad with a finger of the other hand to drain
   stray static charges into the chassis.
   5. Re-calibrate afterwards, if necessary.


If you have an available earth ground, discharging to that as well might
make an interesting variation on the test.






On Sun, Apr 27, 2008 at 7:50 AM, 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.
>
> Dust is an issue at the schools but that can't explain the high rate of
> jumpy cursors. Please assist
>
> 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!
>
> Bryan W. Berry
> Systems Engineer
> OLE Nepal, http://www.olenepal.org
>
>
>
> _______________________________________________
> Olpc-open mailing list
> Olpc-open at lists.laptop.org
> http://lists.laptop.org/listinfo/olpc-open
>



-- 
Steve Holton
sph0lt0n at gmail.com
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