[Wayland-bugs] [Bug 106624] click-drag and 2 finger scroll does not work on Thinkpad T440

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106624

Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
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                 CC|                            |peter.hutterer at who-t.net

--- Comment #2 from Peter Hutterer <peter.hutterer at who-t.net> ---
fwiw, I have a t440s so I know the touchpad, should be the exact same hardware
too.

- two finger scroll ON
- edge scroll ON

These two are mutually exclusive, libinput will enable either but not both.
Which one are you setting last?

trackpoints != touchpads, are you trying to measure the wrong device?

The two-finger scroll attachment 139690 has two fingers down but one finger
isn't moving at all. And by that I don't just mean it's not moving much, it
literally isn't sending any events. That's unusual and points at a
kernel/firmware issue.

For attachment 139689, libinput debug-events --verbose says:

 event20  POINTER_BUTTON   +35.32s      BTN_LEFT (272) pressed, seat count: 1
event20 - palm: touch 0, palm detected (pressure)
 event20  POINTER_BUTTON   +38.74s      BTN_LEFT (272) released, seat count: 0
event20 - button state: touch 0 from BUTTON_STATE_AREA, event BUTTON_EVENT_UP
to BUTTON_STATE_NONE

i.e. as you press down your finger exceeds the pressure threshold and is now
interpreted as palm, hence it stops moving. I guess what we need here is a
extra toggle that labels the clicking finger as not eligible for palm
detection.

I'd appreciate any help with that, I'm a bit short on time atm.

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