[Olpc-open] jumpy cursor problem and sugar issue

Andres Salomon dilinger at queued.net
Sun Apr 27 17:54:22 EDT 2008

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.

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