[Wayland-bugs] [Bug 94910] The cursor "jump" sometimes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94910

--- Comment #18 from Paviluf <jeremy9856 at gmail.com> ---
(In reply to Dudley Du from comment #17)
Hi Dudley,

Thank you for your analysis.

> To doulbe confirm on these symptoms, could you help double check that if it
> was possible that there was a ghost finger reported even there was no finger
> touch on the trackpad device?

Sorry but I don't know how I can do this.

> Or could you try to press the trackpad with a non-conductor object on the
> trackpad device, which may help to reproduce the ghost finger issue.
> Because the ghost may appear and disapper by itself, so it seems that the
> ghost finger was on the edge to be triggered or not on the trackpad device.

With a non conductor object the jump doesn't occur but the click is not taken
into account. The click is triggered only when I have something conductor on
the touchpad. If I let a finger on the touchpad and click with a non conductive
thing there is no jump. 

I don't know if it's relevant because the jump happen when I move the cursor
with the right finger, quickly release it and click with the left finger.

> If the ghost finger happened on the trackpad device, it may indicate the
> hardware has been broken. For example, in the manufacture, there is a
> foreign matter or air was brought in between the malar and the PCB. Or some
> other factors, that has affect the sensors on the fixed area.

I would say that is, even if it's possible, very unlikely.

> So could you also try anohter trackpad on anthoer HP Falco Chromebook?

I can't do that.

I don't know if that matter but in GalliumOS and ChromeOS (they both use the
ChromeOS driver and I don't know if there is some kind of patch that discards
any movement larger than 20mm like in synaptics) there is no jump too.

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