On Wed, Nov 20, 2013 at 11:54:12PM +0100, Friedrich Schöller wrote:

quoted

Trackpads with integrated buttons are hard to use when the driver responds to
movements of the thumb that is resting or clicking on the surface of the
trackpad. This patch adds rudimentary support to filter out these touch events.

The feature can be turned on via sysfs:
	/sys/class/input/input[0-9]+/thumb_ignore:
		Enables thumb detection
		Values: 0/1
	/sys/class/input/input[0-9]+/thumb_ratio_on:
		When the ratio of ABS_MT_TOUCH_MINOR / ABS_MT_TOUCH_MAJOR
		times 100 is smaller than this value the touch qualifies
		as a thumb.
	/sys/class/input/input[0-9]+/thumb_ratio_off:
		When the ratio of ABS_MT_TOUCH_MINOR / ABS_MT_TOUCH_MAJOR
		times 100 is bigger than this value the touch no longer
		qualifies as a thumb.
	/sys/class/input/input[0-9]+/thumb_y_on:
		When ABS_MT_POSITION_Y is bigger than this value the touch
		qualifies as a thumb.
	/sys/class/input/input[0-9]+/thumb_y_off:
		When ABS_MT_POSITION_Y is smaller than this value the touch
		no longer qualifies as a thumb.

I'd rather this been implemented in userspace (synaptics and/or evdev X
drivers).

And it has been in userland since at least 2008. It can be found in
input-synaptics, input-multitouch, input-mtrack, possibly more places.

Thanks,
Henrik

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