linux-kernel - Re: synaptics touchpad doesn't click

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Message-ID: <20091216174218.GC6800@core.coreip.homeip.net>
Date:	Wed, 16 Dec 2009 09:42:19 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Alex Chiang <achiang@...com>
Cc:	Takashi Iwai <tiwai@...e.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: synaptics touchpad doesn't click

On Wed, Dec 16, 2009 at 10:31:59AM -0700, Alex Chiang wrote:
> * Dmitry Torokhov <dmitry.torokhov@...il.com>:
> > On Tue, Dec 15, 2009 at 11:52:00PM -0700, Alex Chiang wrote:
> > > * Dmitry Torokhov <dmitry.torokhov@...il.com>:
> > > > On Tue, Dec 15, 2009 at 06:05:06PM -0700, Alex Chiang wrote:
> > > > > * Dmitry Torokhov <dmitry.torokhov@...il.com>:
> > > > > >
> > > > > > The updated patch is below.
> > > > > > 
> > > > > > -- 
> > > > > > Dmitry
> > > > > 
> > > > > Should I test this one or wait one more iteration to address
> > > > > Takashi's last comments?
> > > > > 
> > > > 
> > > > Actually I think we took the wrong direction with the original patch and
> > > > we should do what other buttonless devices (bcm5974) do: report touchpad
> > > > click as left button and have Synaptics X driver provide enhanced
> > > > support. This way we can have both modes (ClickZones and ClickButtons)
> > > > and users will get to chose (provided that someone takes time to add
> > > > that support to Synaptics driver of course ;) ).
> > > > 
> > > > Could you tell me if the below works for you?
> > > 
> > > Left clicks work. Right/middle do not (as expected, I guess).
> > > 
> > > I liked the behaviour of Takashi's patch a little better wrt what
> > > happens when you try to click/drag, because he disabled movement
> > > in the click area.
> > 
> > Are the clicks register only in that special area? Reading Synaptics
> > product description it sounds like entire surface should be clickable.
> 
> Well, maybe in theory the entire surface is clickable.
> 
> My observation is that the physical design resembles a lever on a
> fulcrum though, with the fulcrum at the edge near the keyboard.
> 
> Pressing the click zone is mechanically nice, since you are away
> from the fulcrum. Moving "up" towards the keyboard, there seems
> to be much less mechanical advantage, and the surface doesn't
> seem so clicky.
> 

I am going off the following:

	http://www.synaptics.com/solutions/products/clickpad

I am no sure whether there are 2 different flavors or if they are all
the same and the only difference is whether the buttons are marked or
not.

> But really, I was talking about what Takashi mentioned in a later
> mail, namely that trying to actually click with the click zone in
> a precise manner is difficult because as you press the surface
> down, the touch pad registers some movement, and moves the
> pointer away from the area you're trying to click.
> 
> Fitts would have a fit. ;)

That will have to be handled in synaptics X driver.

-- 
Dmitry
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