[Wayland-bugs] [Bug 103952] Lenovo G50-45 ETPS/2 Elantech Touchpad strange behavior.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103952

--- Comment #8 from Peter Hutterer <peter.hutterer at who-t.net> ---
The dimensions only affect pointer acceleration etc, they don't produce the
output this recording shows. Grab mtview and run it, then reproduce it. You'll
see the jumping touches quickly. https://github.com/whot/mtview

There is no single definition of ghost touches beyond "the hardware thinks
there is a touch where there is none". That's definitely the case here because
there's no way this was your physical input. Look at attachment 135846, it
illustrates the pressure the recording shows. It's all over the place, and that
diagonal line from 20-42s is just odd, no way could you control your finger
that precisely that you get a pressure increase like this.

If I read comment 6 correctly:
* no pointer movement when not touching
* pointer movement ok when close to the surface without touching
* pointer movement crazy when touching

I don't know how we could possibly detect this. Your best bet would be to
change the pressure ranges and hope that palm detection kicks in for most of
the ghost touches. But that's not a guarantee. See 
https://wayland.freedesktop.org/libinput/doc/latest/udev_config.html#hwdb for
the instructions, this should make your earlier hwdb work.

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