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

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Message-ID: <s5h1viv5lh7.wl%tiwai@suse.de>
Date:	Wed, 16 Dec 2009 10:14:44 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Alex Chiang <achiang@...com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: synaptics touchpad doesn't click

At Wed, 16 Dec 2009 00:20:20 -0800,
Dmitry Torokhov wrote:
> 
> On Wed, Dec 16, 2009 at 08:11:05AM +0100, Takashi Iwai wrote:
> > At Tue, 15 Dec 2009 23:03:43 -0800,
> > Dmitry Torokhov wrote:
> > > 
> > > 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.
> > 
> > In the case of ClickZone, the click in the button area is taken as
> > clicks, if I understand correctly.
> > 
> > The problem is, however, not about where to click.  It's about the
> > precision.  When you click a pad, your finger slips a little bit in
> > millimeter.  This already corresponds to a few pixels, and the pointer
> > moves away from the point you wanted to click.
> >
> 
> Right, this will have to be dealt with in X driver.
> 
> > In my original patch, I disabled the pointer movement in the button
> > area before click for avoiding this problem.
> >
> 
> However it will not work if you want to do 'ClickButtons' mode where
> you don't assign secific areas for clicking.

Yes.  And the area is more or less fixed.


Takashi
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