[Wayland-bugs] [Bug 96275] Acer Aspire 5749 - The cursor jumps when scrolling with two fingers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96275

--- Comment #8 from Benjamin Tissoires <benjamin.tissoires at gmail.com> ---
thanks for the dmesg. Here are my analysis:
- the touchpad is a synaptics one, using the non image sensor
- the touchpad support multi-finger but given the poor tracking, the kernel
sets the SEMI_MT flag.
- the touchpad has the following caps: SYN_CAP_EXTENDED, SYN_CAP_MULTIFINGER,
SYN_CAP_PALMDETECT, SYN_CAP_ADV_GESTURE

So:
- finger jumps in the slotted touches are normal here, we are using semi-mt
protocol
- at E: 0.542783, I don't think the ABS_X/Y are jumping, so you should be fine
in term of scrolling for this event at least.

Peter: when we have semi-mt devices, we can't assume the kernel won't send
jumps. So I think libinput should not tell user-space that there is a jump and
should simply detect and discard the jumps.

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