[ltp] Smooth trackpoint acceleration

[Guarded Identity]

On Monday 05 June 2006 10:16 am, Guarded Identity 
> > That said, if you actually do decide to write an exponential
> > acceleration, it would be nice to have; especially with ordinary mice! If
> > so, you need to patch the X mouse driver, rather than the trackpoint, and
> > I'd suggest starting by raising an issue in the xorg bugzilla.
>
> So I took a (slightly) closer look at Steven's trackpoint driver, and
> noticed that it's a very thin wrapper that literally feeds in hardware
> parameters as per the IBM spec
> (http://wwwcssrv.almaden.ibm.com/trackpoint/files/ykt3dext.pdf).  

Another interesting point is that looking at the IBM spec, on page 40, the 
force-rate transfer function is graphed out.  It's definitely non-linear, and 
I'm sure that's due to some bit of research on IBM's part.  In case you 
look, "value6" ends up being "speed" in SysFS.  So, I guess that's why the 
system that exists now isn't that bad.  

- Sukant