https://bugs.freedesktop.org/show_bug.cgi?id=96690
--- Comment #6 from brent s. <[email protected]> ---
(In reply to Peter Hutterer from comment #5)
> The first event here may show the issue:
>
> E: 0.000001 0001 0145 0000 # EV_KEY / BTN_TOOL_FINGER 0
> E: 0.000001 0001 014d 0001 # EV_KEY / BTN_TOOL_DOUBLETAP 1
>
> This indicates that from the kernel's POV the device switched from single
> finger to two-fingers down. In libinput that usually stops pointer motion
> (depending on finger position it may start 2fg scrolling). Was this
> recording started with your fingers off the touchpad?
Yes; i don't think I bumped into the pad or anything either with the heel of my
thumb/palm. I tried to keep as far away from it as I could when starting. I can
always generate another one via SSH and then try to reproduce while that's
running so I can be sure I had no physical contact with the machine when
starting, but it's fairly sporadic (though often) and a little bit difficult to
reproduce intentionally.
> All other BTN_TOOL_FINGER events point at a potential hardware issue,
> whenever the device switches to single-finger down (FINGER is 1) it
> immediately switches to two fingers in the subsequent event (DOUBLETAP is
> 1). So we either have the hw not noticing that one finger was released or
> in-kernel tracking getting confused.
Hrm.. the hardware's fairly new (laptop was purchased/unboxed about two? three?
weeks ago). That doesn't of course rule out faulty manufacturing but it does
certainly make it being a hardware-level issue less likely, I'd presume.
Anything I can try to help narrow it down?
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