Re: [Olpc-open] jumpy cursor problem and sugar issue
Hello all, On Fri, May 9, 2008 at 5:44 AM, Bryan Berry [EMAIL PROTECTED] wrote: thanks, will try this out On Thu, 2008-05-08 at 16:01 -0400, Samuel Klein wrote: Advice from the field : try dusting a jumpy touchpad with chalkdust. --SJ, who is looking for a cite... Yes this is a discovery from a child at Atlas Public school pilot in Pakistan. What my findings are that this is due to the moisture on the finger tips that makes this touchpad go wild . What I suggest is that use any softer powder, chalk dust is not fine powder and makes scratches on the touchpad. Any powder is ok as far as it can remove that moisture. Regards -wt 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 ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel -- Waqas Toor member of OLPC Pakistan Team member of Ubuntu Pakistan Team Linux *is* user friendly. It's just selective about who its friends are. In a world without walls and fences, who needs windows and Gates ? http://waqastoor.weblog.pk (Registered Linux user #424056) ref link http://counter.li.org/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [Olpc-open] jumpy cursor problem and sugar issue
Advice from the field : try dusting a jumpy touchpad with chalkdust. --SJ, who is looking for a cite... 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 ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [Olpc-open] jumpy cursor problem and sugar issue
thanks, will try this out On Thu, 2008-05-08 at 16:01 -0400, Samuel Klein wrote: Advice from the field : try dusting a jumpy touchpad with chalkdust. --SJ, who is looking for a cite... 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 ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [Olpc-open] jumpy cursor problem and sugar issue
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] ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: [Olpc-open] jumpy cursor problem and sugar issue
Steve Holton wrote: 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. Most that touchpad issues arise from two distinct sources: driver and capacitance grounding. In touchpads, the finger acts as a virtual grounding device. Dust/dirt/grime may create problems with this grounding effect. So, cleaning the pad and grounding any extra static buildup (Steve's solution above) should help. I don't know much about touchpad driver issue(s) if any with the XO. See http://en.wikipedia.org/wiki/Touchpad#Theory_of_operation http://www.synaptics.com/technology/cps.cfm http://www.synaptics.com/products/touchpad_faq.cfm#Q2 Sameer On Sun, Apr 27, 2008 at 7:50 AM, Bryan Berry [EMAIL PROTECTED] mailto:[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] mailto:[EMAIL PROTECTED] http://lists.laptop.org/listinfo/olpc-open -- Steve Holton [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] ___ Olpc-open mailing list [EMAIL PROTECTED] http://lists.laptop.org/listinfo/olpc-open ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
