[Wayland-bugs] [Bug 105043] 3-fingers touch occasionally fails to get detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105043

--- Comment #15 from Hi-Angel <Hi-Angel at yandex.ru> ---
(In reply to Peter Hutterer from comment #14)
> (In reply to Hi-Angel from comment #13)
> > Np, I did the record with the option; will try the kernel boot option, but a
> > bit later — I'm travelling, don't have ATM a live-usb/cd to boot from if I
> > screw up something.
> 
> add it manually on boot instead of writing into the grub.cfg and the worst
> thing that can happen is that you don't have a touchpad :)
> 
> > 	event7  - tap state: TAP_STATE_IDLE → TAP_EVENT_TOUCH → TAP_STATE_TOUCH
> > 	event7  - tap state: TAP_STATE_TOUCH → TAP_EVENT_TOUCH → TAP_STATE_TOUCH_2
> > 	event7  - tap state: TAP_STATE_TOUCH_2 → TAP_EVENT_MOTION →
> > TAP_STATE_TOUCH_2_HOLD
> > 	event7  - tap state: TAP_STATE_TOUCH_2_HOLD → TAP_EVENT_MOTION →
> > TAP_STATE_TOUCH_2_HOLD
> 
> translation: idle to 'one finger down' to 'two fingers down' to 'motion
> threshold exceeded'. if you have the git repo, there is a
> touchpad-tap-state-machine.svg that illustrates all this. try not to scream
> when you see it first ;)

Thanks, I like the graph, though I think being svg is not good. I think such
graph would be nicer in html, or something alike that would allow a text
search/highlight.

> > 	event7  - tap state: TAP_STATE_TOUCH_2 → TAP_EVENT_MOTION →
> > TAP_STATE_TOUCH_2_HOLD
> 
> same here - you're getting motion events when the second finger is down,
> exceeding the internal thresholds and we go from tap to just 'two fingers
> down'. note that the state machine is independent of everything else, so
> tapping is in the 'two fingers down' state when e.g. you're two-finger
> scrolling.
> 
> The 'button state' debug events are for the software button state, unrelated
> again.

Thanks, I think I see. For the record, I might be getting motion events of
fingers down because I'm also affected by #104828 aka "wobbly touchpad". 2 days
ago I did also override hysteresis locally to have it always enabled — and I
think this codepath ought to remove the motion before deciding if the user is
scrolling or not.

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