Comment 18 for bug 381884

I'm not sure about this. I know that the synaptic driver can use multiple
hardware drivers. In my system, I am using "appletouch.c" which I believe
has support for all modern macbook, macbook pros, powerbooks, and ibooks.
There are branchings (if statements) in the driver that execute different
buffer reading procedures depending on how the trackpad identifies itself.

There may be an intermediate driver that could be different though. That
would make sense as to why the two finger jumpiness is not present with all
macbooks.

Thanks Nikos for testing out the jumpy cursor thing. Someone with a bit
more experience with reading trackpad input could give some insight into the
best way to read sensory data. Right now I think it is just a linear
weighting (ie every sensor has equal weight) but I think that the "primary"
sensor that your finger is connecting with should have a higher weighting so
that the cursor doesn't jump around as much... but even that doesn't exactly
seem right.

Blaine

On Tue, Apr 13, 2010 at 10:36 PM, hanzomon4 <email address hidden> wrote:

> Correct me if I'm wrong but multitouch pads use a different driver then the
> older ones. I know that my old 3.1 pro jumps all over the place when two
> fingers are placed on it, unless its precisely at the same time
>