[PATCH libinput] touchpad: implement edge-based basic palm detection

[Peter Hutterer]

On Fri, Jul 11, 2014 at 08:34:32AM +0200, Daniel Martin wrote:
> On Fri, Jul 11, 2014 at 11:08:53AM +1000, Peter Hutterer wrote:
> > A large part of palm events are situated on the far edges of the touchpad. In
> > a test run on a T440s while typing a long email all but 2 touch points were
> > located in the outer ~5% of the touchpad. Define a 10% exclusion zone on the
> > left and right edges in which new touchpoint is automatically assigned to be a
> > palm.
> > 
> > A finger may move into that exclusion zone without being marked as palm, it
> > just can't start in one.
> > 
> > On clickpads, the exclusion zone does not extend into the software buttons.
> > 
> > Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
> > ---
> 
> I don't have the big picture (of libinput) atm. Does this stand in the
> way of edge-scolling (in the future)?

in this simple form - yes, it would. once we add edge scrolling we'll need
to take this into account but for now getting basic palm detection is
pretty high on the todo list. The t440 is almost unusable without it.

Cheers,
   Peter