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On 2009-08-03T02:02:11+00:00 Alberto Milone wrote:

The vertical (right) edge area on the touchpad begins at 5312 (the right
edge value) but doesn't end where the physical right edge is
(priv->maxx). As a result, right edge scrolling takes place only in a
vertical stripe which is almost in the middle of the touchpad while it
should flush against the physical right edge.

No scrolling takes place right of the vertical stripe, only movements.

NOTE: this happens with some Synaptics and Elantech touchpads.

Reply at: https://bugs.launchpad.net/xorg-driver-
synaptics/+bug/403869/comments/8

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On 2009-08-03T05:08:35+00:00 Peter Hutterer wrote:

my first guess is that this is done by clipping in the server.
I can't reproduce this on my touchpad though.

Please clone git://people.freedesktop.org/~whot/testdevices.git and
create a simple test device with the values on your touchpad. It's quite
easy to do and there are already a few devices that can serve as
example.

that'd help reproduce it on my side so we can fix it.

Reply at: https://bugs.launchpad.net/xorg-driver-
synaptics/+bug/403869/comments/9

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On 2009-08-03T08:43:05+00:00 Alberto Milone wrote:

Created an attachment (id=28305)
Patch to test the devices

Does the attached patch help?

It should reproduce the behaviour of my Elantech touchpad and the one of
the Synaptics touchpad used by the user who reported the problem on
Launchpad.

Let me know if you need further information.

Also I would like to know where clipping takes place so that I can
investigate the problem.

Reply at: https://bugs.launchpad.net/xorg-driver-
synaptics/+bug/403869/comments/11

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On 2009-08-03T23:40:34+00:00 Peter Hutterer wrote:

(In reply to comment #2)
> Does the attached patch help?

did you test this? both devices fail immediately with an "invalid
argument" error.

Reply at: https://bugs.launchpad.net/xorg-driver-
synaptics/+bug/403869/comments/12

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On 2009-08-04T01:48:35+00:00 Alberto Milone wrote:

Created an attachment (id=28333)
Patch to test the devices - tested

I found the reason why the two programs failed.

It looks like neither dev->absmax[ABS_PRESSURE] nor can
dev->absmax[ABS_TOOL_WIDTH] can be 0.

Using evtest Elantech reports dev->absmax[ABS_PRESSURE] = 0 while the
Synaptics touchpad reports dev->absmax[ABS_TOOL_WIDTH] = 0.

My patch works now.

Reply at: https://bugs.launchpad.net/xorg-driver-
synaptics/+bug/403869/comments/13

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On 2009-08-04T18:30:39+00:00 Peter Hutterer wrote:

I think I didn't provide enough information with my first comment. So
the problem is that I cannot reproduce the effect on my touchpad,
scrolling works all the way up to the right edge.

These things are simple to reproduce with software test devices as you
can force a device to look a certain way and you can force a distinct
set of events.

With the patch above, the cursor simply moves left/up to right/bottom
and back. This wouldn't trigger scrolling on any touchpad, so the test
device as is cannot be used to reproduce the bug.

Please modify the test device's run method to send events that trigger
scrolling in the first region but don't trigger scrolling in the second
region (even though they should). I can then run this here and see what
happens in the driver.

Reply at: https://bugs.launchpad.net/xorg-driver-
synaptics/+bug/403869/comments/14

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On 2009-10-07T18:21:49+00:00 Peter Hutterer wrote:

I just had a look at this again and the source of the whole issue is
that the touchpad reports different coordinates that it provides. From
the launchpad bugreport:

700-1100 no mouse movement
1100-5200 regular mouse movement
5200-5900 scrolling movement
5900-6250 no mouse movement

from the log: 
(II) SynPS/2 Synaptics TouchPad: x-axis range 1472 - 5472
(II) SynPS/2 Synaptics TouchPad: y-axis range 1408 - 4448

so anything above 5472 is iffy anyway. It also explains why a uinput
test device is pointless here, uinput won't allow this stuff.

looking at the code, there's a few places where this could cause issues,
especially when scaling back. However, I need feedback for a current
version of synaptics, not 0.99.3 which the original bugreport is based
on.

Is this still an issue with an up-to-date driver?

Reply at: https://bugs.launchpad.net/xorg-driver-
synaptics/+bug/403869/comments/15


** Changed in: xorg-driver-synaptics
   Importance: Unknown => Medium

-- 
Soltech TA12 touchpad scrolling area not flush to the right
https://bugs.launchpad.net/bugs/403869
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