Bug 91097

Summary:	Pointer sometimes moves before hard click on trackpad
Product:	Wayland	Reporter:	Wade Berrier <wberrier>
Component:	libinput	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED INVALID	QA Contact:
Severity:	normal
Priority:	medium	CC:	benjamin.tissoires, peter.hutterer
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	94861, 99268
Attachments:	attempted sloppy hard clicks on paint app single hard click recording multiple hard clicks recording

Description Wade Berrier 2015-06-24 19:53:54 UTC

Sometimes when doing a "sloppy" hard click on the trackpad, the pointer will move enough so that the intended target is not clicked.  (A sloppy click being where your finger rolls down as it's clicking).

This was greatly improved in the 0.18 release, but there are additional improvements that can be made.

See https://bugzilla.redhat.com/show_bug.cgi?id=1230441 for related information.


See the attached image for a better description of what is going on.  In the image, it was intended that the dots line up horizontally.  For the dots that don't line up, that's because the pointer moved before the click was registered.

Comment 1 Wade Berrier 2015-06-24 19:55:07 UTC

Created attachment 116699 [details]
attempted sloppy hard clicks on paint app

Comment 2 Wade Berrier 2015-06-24 19:56:27 UTC

Created attachment 116700 [details]
single hard click recording

Comment 3 Wade Berrier 2015-06-24 19:56:54 UTC

Created attachment 116701 [details]
multiple hard clicks recording

Comment 4 Peter Hutterer 2015-06-25 01:44:12 UTC

for the archives, we need to track pressure changes to predict this (not possible on all touchpads)

Comment 5 Peter Hutterer 2016-01-08 05:50:23 UTC

No-one is currently working on this, anyone to stumble across this bug please feel free to take it.

Comment 6 Peter Hutterer 2016-05-06 05:22:17 UTC

Small update: I was testing this on an apple laptop recently and afaict they have a bottom button area (hidden of course since they use clickfinger to actually click) where this motion gets discarded. This could be a solution for libinput, where clickfinger is enabled, the lower area of the touchpad could be less sensitive to movements for a short timeout after finger down.

Comment 7 Peter Hutterer 2017-05-19 05:03:52 UTC

*** Bug 94861 has been marked as a duplicate of this bug. ***

Comment 8 Peter Hutterer 2017-08-28 04:51:40 UTC

can you try this with libinput master please? we now have touch pressure detection so we should detect a touch a bit later than before. This may help with this bug (but it's not a guarantee)

Comment 9 Peter Hutterer 2017-10-11 03:10:27 UTC

needinfo for 6+ weeks, and I think it may have improved with 1.8 anyway. let's re-open this if necessary

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