[PATCH] ClickPad support v4

Chris Bagwell chris at cnpbagwell.com
Tue Dec 28 21:08:11 PST 2010

On Tue, Dec 28, 2010 at 10:06 PM, Kevin O'Connor <kevin at koconnor.net> wrote:
> On Mon, Dec 27, 2010 at 03:04:46PM -0600, Chris Bagwell wrote:
>> Since xf86-input-synaptics 1.3.0 handles (X,Y) jumps during finger
>> transitions, if clickpad users set their EmulateTwoFingerMinW to 5 I
>> suspect they will see a lot less big cursor jumps... but they will
>> still see small cursor movement click operations.  Users could make
>> use of AreaBottomEdge to shrink size of touchpad to work around the
>> smaller movement.
> I was playing around with this a little.
> Setting "AreaBottomEdge=3800" did make the mouse jitter on button
> press go away (at the cost of a smaller touchpad area).  (Of course,
> this would still need to work once left/right/middle button detection
> is implemented.)
> I can also confirm that setting EmulateTwoFingerMinW=5 stops cursor
> jumps when pressing two fingers.  With a larger EmulateTwoFingerMinW
> size, whenever I touch a second finger higher up on the clickpad the
> cursor jumps.  The distance of the jump is proportional to how far
> away my second finger is to the first finger.  The cursor jumps back
> if I lift the second finger before lifting the first.  Interestingly,
> pressing a second finger lower on the touchpad does not cause jumps.
> Also interesting - if I set "AreaBottomEdge=3800" and I press the
> first finger in the button area, and then press a second finger higher
> up on the touchpad, then I don't get a jump.  (Maybe because X ignored
> the first touch and then didn't get confused on the second?)
> -Kevin

Thank you for confirmation the 2 settings are an improvement.

It sounds mostly like I expected; especially for case
whenEmulateTwoFingerMinW is greater then 5 .

The Area*Edge logic doesn't currently account for multi-finger touch
so I'm glad you didn't mention anything to negative occurring when 2
touches occur.


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