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 <[EMAIL PROTECTED]> 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 > [email protected] > http://lists.laptop.org/listinfo/olpc-open > -- Steve Holton [EMAIL PROTECTED]
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