[Olpc-open] jumpy cursor problem and sugar issue

[Paul Fox]

as a datapoint on touchpad problems, today my XO was showing the
"psychic" behavior -- i could move the cursor with my finger 1/4"
to 1/2" above the surface.  it was not particularly "jumpy".

i assume it was fairly humid, given the drizzle in boston today. 
i grounded myself to the screw, as described below.  there was no
change in the psychic behavior.

i did the four finger salute, and the problem cleared up
completely.

(this is a late G1G1 unit.)

paul

steve wrote:
 > Do you have a way to accurately measure relative humidity?
 > 
 > 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
 > part 2     text/plain                 129
 > _______________________________________________
 > Devel mailing list
 > Devel at lists.laptop.org
 > http://lists.laptop.org/listinfo/devel

=---------------------
 paul fox, pgf at foxharp.boston.ma.us (arlington, ma, where it's 40.3 degrees)