20.02.2014 11:14, Peter Hutterer wrote:
On Wed, Feb 19, 2014 at 11:55:28AM +0600, Alexander E. Patrakov wrote:
19.02.2014 04:52, Peter Hutterer wrote:
The set of touchpad patches I sent out recently already handle this by
default. When the physical clickpad button is depressed, the driver picks
the finger that is pressing the button (sometimes guessing, but hey...).
That finger cannot control the pointer movement until the button is released
again.
In your specific use case, the driver would see two touchpoints and it will
select the one closer to the bottom edge as the pressing finger (i.e. your
thumb). The index finger can still move while the button is down.
From my experience with the Sony touchpad (Vaio Z23A4R laptop), I'd
say that it doesn't solve the whole problem. Here is what goes wrong
with the old synaptics driver by default and can be worked around
with AreaBottomEdge.
Option "SoftButtonAreas" "4360 0 4000 0 2880 4359 3500 0"
Option "AreaBottomEdge" "3500"
1. I move the right-hand index finger on the touchpad, thus moving
the pointer to the place where I want to click.
2. I place the left-hand index finger into the virtual-button area,
while still keeping the right finger on the touchpad. I cannot
remove the right-hand finger: if I do that, while the contact area
shrinks, its center also moves, and the driver picks that up.
3. As I increase the pressure on the left-hand finger until the
touchpad clicks, the contact area increases. Unfortunately, its
center moves, too, and this can accumulate to ~2-3 pixels until it
clicks.
The important point is that the bad thing happens before the
hardware button click, so the quoted solution totally misses the
point.
So we need something, either a sledgehammer solution in the form of
ignoring all motion in the virtual button area (but that would break
Sony Vaio Duo 13 because the only usable height of the virtual
button area is 100% there), or some very good filter that pays
can you expand on the 100% comment here? is the touchpad too small for
anything else?
The height of the touchpad is too small (the width is OK). See e.g.
http://www.blogcdn.com/www.engadget.com/media/2013/06/dsc00149-1370365891.jpg
(Just to avoid confusion: I have a Sony Vaio Z23A4R, don't have a Sony
Vaio Duo 13, and don't have a Sony Vaio Pro 13. As for my accent on Sony
laptops, that's only because there is a Sony shop nearby.)
attention to changes in pressure and filters any spurious movement
(i.e. any movement that is combined with significant pressure
changes) out.
But hey, Sony in their new laptops started to ignore the problem
under Windows, too, so I think I just have to swallow this and/or
use my Bluetooth mouse.
couple of comments here:
2 is a synaptics bug that should really be fixed, the driver shouldn't be
that sensible - in fact there's probably something that can be done about
making the driver more sensible while the finger is moving and less sensible
while the finger is still (just an idea, may not work for small
movements). there is also the option of using pressure to counteract
movements, i.e. a pressure change will increase the hysteresis to avoid
erroneous movements. If you have that many issues with the Sony, I really
recommend looking at the evdev-mt-touchpad patches I sent to this list,
it'll allow for things like that relatively simple.
OK, I will build this on my laptop from git later today.
the xorg synaptics driver has for historical reasons and portability a
different approach to finger tracking and some of the misbehaviours are
easier to fix now.
The proposed patches have a different approach to the above:
1 - would be recognised as touchpoint, since no other finger is active it is
designated as the pointer-moving touchpoint
2 - second finger recognised, but not assigned as pointer-moving. Movements
on that finger have no effect, unless 2-finger scrolling is triggered.
3 - no effect, finger is not moving
So really, the goal here is that whatever the motion we see in 2 and 3 is to
not go past the "trigger 2-finger scrolling" threshold.
Yes, I think we agree on that.
I do have a set of patches not yet ported for the virtual buttons and they
add additional tracking, so that a finger that starts (and stays) inside a
softbutton area won't contribute to movements, but as you said above that
may not work with the vaio.
Yes, I would like to see that on my Z23A4R (and it matches the Windows
default), but users of Duo 13 definitely would not want that enabled on
their laptops. As for Sony Vaio Pro 13, this feature won't hurt, but, as
I have already said, does not match the Windows default there.
--
Alexander E. Patrakov
_______________________________________________
wayland-devel mailing list
[email protected]
http://lists.freedesktop.org/mailman/listinfo/wayland-devel
