[Olpc-open] jumpy cursor problem and sugar issue
sph0lt0n at gmail.com
Sun Apr 27 09:36:32 EDT 2008
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
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
> 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
sph0lt0n at gmail.com
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