Bug 91081

Summary:	AlpsPS/2 ALPS DualPoint TouchPad two finger scrolling is jumpy
Product:	Wayland	Reporter:	Ignacio Casal Quinteiro <nacho.resa>
Component:	libinput	Assignee:	Wayland bug list <wayland-bugs>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	nacho.resa, peter.hutterer
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	evemu log

Description Ignacio Casal Quinteiro 2015-06-24 11:15:33 UTC

So out of curiosity I tried today with the two finger scrolling, and trying to scroll a document in gedit is jumpy as in not very smooth. See though that I am currently using the package from here:
http://koji.fedoraproject.org/koji/taskinfo?taskID=10152166

See https://bugs.freedesktop.org/show_bug.cgi?id=90990 for reference.

Comment 1 Ignacio Casal Quinteiro 2015-06-24 11:17:05 UTC

Created attachment 116688 [details]
evemu log

Here you can find the log when scrolling with 2 fingers

Comment 2 Peter Hutterer 2015-07-14 00:22:32 UTC

this is a semi-mt touchpad where the resolution just isn't there when two fingers are on the touchpad. I'm almost tempted to disable two-finger scrolling on those pads.

have a look at the value jumps between the various ABS_MT_POSITION_X/Y coordinates, they are huge.

Comment 3 Ignacio Casal Quinteiro 2015-07-14 06:19:55 UTC

I wonder if it is a bug in the driver since on windows two finger scrolling is also the default way. Though I always preferred the edge one.

Comment 4 Peter Hutterer 2015-07-15 00:10:08 UTC

does the two-finger scrolling work fine in Windows?

Comment 5 Ignacio Casal Quinteiro 2015-07-15 06:27:49 UTC

yeah, on windows the two finger one seems to work fine. See also that for linux the driver was reverse engineered

Comment 6 Peter Hutterer 2015-07-22 05:23:53 UTC

judging by Hans' comments this should be fixed with recent kernels, any chance you can try that? looks like v4.2-rc1 has all the changes.

Comment 7 Peter Hutterer 2015-08-12 04:25:16 UTC

ping?

Comment 8 Ignacio Casal Quinteiro 2015-08-12 06:22:01 UTC

Peter, sorry for not replying. It seems f22 still has 4.1 so I'd rather wait for the update before messing up with the kernel.

Comment 9 Peter Hutterer 2015-08-13 00:01:45 UTC

ok, thanks. I'll close the bug for now, otherwise I keep clicking on it wondering why it's still open :)

As I said in Comment 6, the patches to fix this should've gone into v4.2-rc1, so if it the problem still occurs with that kernel, please reopen this bug.

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