[Wayland-bugs] [Bug 105696] Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105696

--- Comment #12 from Maximilian Böhm  ---
Thanks! :) Must have overlooked this.

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[Wayland-bugs] [Bug 105696] Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105696

--- Comment #11 from Peter Hutterer  ---
Yes, the commit in comment 8 is on git master now, either use that or get your
distribution to cherry-pick that commit. Or wait for the next 1.10.x stable
branch release, I'll probably copy that over.

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[Wayland-bugs] [Bug 105696] Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105696

--- Comment #10 from Maximilian Böhm  ---
So, "resolved fixed" means that you have already fixed this in code?

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[Wayland-bugs] [Bug 105696] Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105696

--- Comment #9 from Benjamin Tissoires  ---
(In reply to Peter Hutterer from comment #7)
> First I think there's something wrong with your kernel
> 
> E: 0.253846 0001 0145 0002  # EV_KEY / BTN_TOOL_FINGER  2
> 
> I haven't seen that before, a repeat event for BTN_TOOL_FINGER? Benjamin,
> any ideas? 

That's because the input device is created partly from the report descriptor,
partly from scratch. The EV_REP bit is set because of the keyboard emulation in
the device, and so any key event will get repeated. We can safely ignore those.

> Also, the slot association is strange, usually the slot numbers
> match the fingers down and get re-used, this recording seems to use them in
> seemingly arbitrary order. That's generally fine, just unusual.
> 

That's because it's one of these devices where the slot is directly forwarded
from the device, not generated by the kernel. IIRC, on the magicmouse, if you
touch at one place, release, then touch at the same spot, the slot will stay
the same. If you touch anywhere else, the slot will be different.

It's information, but we don't do anything about it under Linux as only those 2
devices are consistently reporting this that way.

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[Wayland-bugs] [Bug 105696] Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105696

Peter Hutterer  changed:

   What|Removed |Added

 Resolution|--- |FIXED
 Status|ASSIGNED|RESOLVED

--- Comment #8 from Peter Hutterer  ---
commit 928bad9104f6270dc638022ba8cc20f42a0e1b41
Author: Peter Hutterer <>
Date:   Thu Apr 5 11:18:40 2018 +1000

 touchpad: don't process state for a touch in TOUCH_NONE

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[Wayland-bugs] [Bug 105696] Apple Magic Trackpad scrolling prevented by speed-based thumb detection (libinput 1.10)

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=105696

Peter Hutterer  changed:

   What|Removed |Added

Summary|Apple Magic Trackpad|Apple Magic Trackpad
   |scrolling sensitivity too   |scrolling prevented by
   |low (libinput 1.10) |speed-based thumb detection
   ||(libinput 1.10)
 Status|NEEDINFO|ASSIGNED
 CC||benjamin.tissoi...@gmail.co
   ||m

--- Comment #7 from Peter Hutterer  ---
First I think there's something wrong with your kernel

E: 0.253846 0001 0145 0002  # EV_KEY / BTN_TOOL_FINGER  2

I haven't seen that before, a repeat event for BTN_TOOL_FINGER? Benjamin, any
ideas? Also, the slot association is strange, usually the slot numbers match
the fingers down and get re-used, this recording seems to use them in seemingly
arbitrary order. That's generally fine, just unusual.

Back to libinput: the issue is definitely the touch size threshold, there are
only few events below 60, followed immediately by events above the threshold.

The problem appears to be:
 event25 - touch 7 is speed-based thumb
 event25 - touch 2 is speed-based thumb
 event25 - touch 4 is speed-based thumb
 event25 - touch 10 is speed-based thumb

This appears before every POINTER_MOTION sequence when two fingers are down. In
short, the problem here is that the second finger is detected as thumb after
the first finger moved. Not 100% sure yet why this happens, e.g. 3.712742
starts touch 7 after a single event of touch 9. We require 4 events for
speed-based thumb detection though, so this simply shouldn't happen. I'll try
to dig into this.

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