[Wayland-bugs] [Bug 89683] Two finger scrolling isn't smooth

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89683

--- Comment #13 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
Hi,

(In reply to Peter Hutterer from comment #12)
> I think keeping the accurate touch info for touch 1 is better, so your
> second approach.

Ok, I will go work on the kernel side of that then.

> What type of libinput changes do we need though? it looks
> like changing that in the kernel would give us sufficient information in
> libinput to just keep doing what we're doing right now.

Even when touch1 is accurate then touch2 will still jump from one location to
the next because it is still low resolution. Since we average the movement of
both fingers for 2g scrolling this means that scrolling will be smooth until
the 2nd touch jumps and then the scrolling will jump too, move smooth again,
jump at the next transition, etc. So for 2fg scrolling on semi-mt touchpads
libinput should only look at slot 0.

Regards,

Hans

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/wayland-bugs/attachments/20150424/b5f3381c/attachment.html>