[Nepal] [Fwd: Re: jumpy cursor problem and sugar issue]

Bryan Berry bryan.berry at gmail.com
Wed Apr 30 00:44:56 EDT 2008

Hey guys,

The new driver for the touchpad that may fix the jumpy cursor problem.

The catch is that it is part of new kernel release for the XO. Would
take me a solid week of full-time testing to evaluate whether we could
deploy it in the schools.

First I have to reproduce the problems we are having at the schools from
our office. Won't get to that until I get back to the office and get our
file server up and running

(writing from bed)

-------- Forwarded Message --------
From: Andres Salomon <dilinger at queued.net>
To: Bernie Innocenti <bernie at codewiz.org>
Cc: Bryan Berry <bryan.berry at gmail.com>, olpc-open
<olpc-open at lists.laptop.org>, OLPC Developer's List
<devel at lists.laptop.org>, sugar <sugar at lists.laptop.org>
Subject: Re: jumpy cursor problem and sugar issue
Date: Sun, 27 Apr 2008 17:54:22 -0400

On Sun, 27 Apr 2008 17:34:30 +0200
Bernie Innocenti <bernie at codewiz.org> wrote:

> Bryan Berry wrote:
> > 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
> Can you explain in detail the behavior of the cursor when it's
> acting erratically?
> There are many independent touchpad problems that look alike.
> Of these, the only one I could fix in software was this one:
>   http://dev.laptop.org/ticket/2804
> The symptoms of #2804 are quite distinctive: the cursor jumps immediately
> towards the bottom-right corner of the screen each time you put your
> finger on the touchpad.
> Dilinger and Smithbone have been working on the calibration issue,
> but I don't know if they finally succeeded.
> Dilinger also had a cleaned up version of the driver, combining
> together several touchpad fixes, cleanups and re-enabling the pen
> tablet too (#5268). That patch-set had been held until after Update.1
> because it introduced yet another regression (#6079).

Yeah, all the code's in master.  No known bugs in the touchpad driver, but
the kernel was just updated to 2.6.25.  Of course, the most important
change might be the PT-in-relative-mode thing; when the GS screws up,
just push down hard and use the PT to do what you want to do.

Bryan W. Berry
Systems Engineer
OLE Nepal, http://www.olenepal.org

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