Hi,

On Sun, Feb 19, 2017 at 01:07:26PM +0100, H. Nikolaus Schaller wrote:

I don't really remember when we noticed it first. Maybe it was
back in tslib times some years ago where setting the sensitivity
threshold made problems. We then carried along our patch for a
long time in our local repo (and modified it several times) and
only started upstreaming some months ago. [...]

AFAIK, GIMP and for example https://sourceforge.net/projects/xournal/ appear
to be able to handle X pressure, but I haven't running and tested either one
on our devices. Pressure is used in such drawing tools to simulate that some
physical pens make wider strokes on higher pressure.

This seems to indicate that X can handle pressure in a non-boolean way, but rarely does.
Especially I think the usual menu, click, drag, scroll gestures are only based
on BTN_TOUCH status and not on ABS_PRESSURE. So it is rarely noticed to make
a difference.

ok.

quoted

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I suggest to put the resistance vs pressure thing in its own patch,
that also fixes tsc200x-core and merge it to linux-next after the
merge window.

Ok. I will propose a patch.

Thanks. I suggest to add this in the patch description:

While this patch changes the values reported to userspace,
ABS_PRESSURE is used rarely by userspace. Most software only
relies on BTN_TOUCH (boolean), which is not affected by this
patch. Some graphics software makes use of the interface and
does not work correctly with the currently used inverted
behaviour.

-- Sebastian