Re: Synaptics Multi touch capabilities

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Fri, Dec 25, 2009 at 12:54:16PM +0100, Erik Andrén wrote:
> 2009/12/25 Dmitry Torokhov <dmitry.torokhov@gmail.com>:
> > On Thu, Dec 24, 2009 at 11:54:27AM +0100, Erik Andrén wrote:
> >> 2009/12/23 Dmitry Torokhov <dmitry.torokhov@gmail.com>:
> >> > On Wednesday 23 December 2009 03:13:04 am Erik Andrén wrote:
> >> >> Hi,
> >> >> I have a ASUS 1005HA netbook equipped with a Synaptics touch pad:
> >> >> [   18.341491] Synaptics Touchpad, model: 1, fw: 7.2, id: 0x1a0b1,
> >> >> caps: 0xd04731/0xa40000
> >> >>
> >> >> In Linux, no multitouch capabilities are detected (Zoom, two and three
> >> >> finger button presses etc.).
> >> >> This all works with the same hardware in windows 7.
> >> >> Is there a bug in the linux driver preventing multitouch to work?
> >> >>
> >> >
> >> > Linux Synaptics driver does not have full multitouch support (yet?). The 2-
> >> > and 3- finger taps should work (provided that they are enabled in SYnaptics X
> >> > driver) but there is no multiple finger tracking...
> >> They don't. I've tried with the 1.1.2 and 1.2.0 version of the xorg
> >> synaptics driver. But if this is the issue I guess I should take this
> >> inquiry to the proper xorg mailing list.
> >
> > Not yet, kernel needs to add support for this as well.
> >
> >>
> >> >
> >> > BTW, the capability 0xd04731 indicates that your hardware does not report
> >> > multi-finger taps.
> >> >
> >> I'm aware of that, but why does pinch and zoom then work in windows 7?
> >> Is it possible to emulate this with a single touch touchpad?
> >>
> >
> > I think your touchpad is a fully multi-finger one, not just multi-finger
> > tapping like older touchpads. Only multi-finger tapping is currently
> > supported by Synaptcs X driver.
> >
> Could you elaborate on what a multi-finger touchpad is?

Multi-finger touchpad (or touchscreen) is a device that can recognize
several objects touching the surface of the device and report separate
sets of coordinates (and maybe more data) for every object.

> The Synaptics PS/2 Touchpad Interface Guide, 3.2.6 states that two and
> three fingers are only detected when the capMultiFinger capability is
> detected which according to the driver isn't detected for this
> touchpad.
> 

Apparently this guide is a bit obsolete.

-- 
Dmitry
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