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 <div class="gmail_quote">On Sun, Apr 27, 2008 at 7:50 AM, Bryan Berry <<a href="mailto:bryan.berry@gmail.com">bryan.berry@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> 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. <div><div></div><div class="Wj3C7c"> 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 <<a href="mailto:arjun@laptop.org">arjun@laptop.org</a>> > wrote: >         Bryan, > >         Similar issues were dominant at the India pilot too... > >         On Sun, Apr 27, 2008 at 5:20 PM, Bryan Berry >         <<a href="mailto:bryan.berry@gmail.com">bryan.berry@gmail.com</a>> 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, <a href="http://www.olenepal.org" target="_blank">http://www.olenepal.org</a> >         > >         > >         > >         >  _______________________________________________ > >         >  Devel mailing list >         >  <a href="mailto:Devel@lists.laptop.org">Devel@lists.laptop.org</a> >         >  <a href="http://lists.laptop.org/listinfo/devel" target="_blank">http://lists.laptop.org/listinfo/devel</a> >         > > > > >         -- >         Arjun Sarwal >         Intern, One Laptop per Child >         Email: <a href="mailto:arjun@laptop.org">arjun@laptop.org</a> >         IRC: arjs on <a href="http://irc.freenode.net" target="_blank">irc.freenode.net</a> in #olpc, #olpc-health, #sugar >         Skype: arjunsarwal85 >         _______________________________________________ >         Devel mailing list >         <a href="mailto:Devel@lists.laptop.org">Devel@lists.laptop.org</a> >         <a href="http://lists.laptop.org/listinfo/devel" target="_blank">http://lists.laptop.org/listinfo/devel</a> > > > > -- > "Always do right," said Mark Twain. "This will gratify some people and > astonish the rest." _______________________________________________ Devel mailing list <a href="mailto:Devel@lists.laptop.org">Devel@lists.laptop.org</a> <a href="http://lists.laptop.org/listinfo/devel" target="_blank">http://lists.laptop.org/listinfo/devel</a> </div></div></blockquote></div>