[Wayland-bugs] [Bug 89725] Default settings are unusable with thinkpad x230 touchpad

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89725

--- Comment #9 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
Hi,

(In reply to Benjamin Tissoires from comment #8)
> So I got my hand on a x230t, and confirmed the behaviour as Hans said.
> Unfortunately, the raw incoming data seems to be correctly transferred to
> the user space, and indeed, the X and Y do not change at each report.
> 
> I tried looking into the various configuration options that can control the
> touchpad without much success. One last thing which worries me a little bit
> is the statement in page 22 of the Synaptics PS/2 interfacing guide
> 11-000275-01 Rev B:
> "The Synaptics Windows drivers operate the pad in Absolute mode. They use
> advanced algorithms to transform the absolute (X, Y, Z) data into smooth
> relative cursor motion"
> 
> From what I can tell, this is worked around in software by Windows.

Thanks for looking into this, what I find strange and which is why I still
think this is a bug in the lower layers is that:

1) The vertical resolution is fine, I know the touchpad has somewhat non 4:3
dimensions, but even accounting for that the horizontal resolution should not
be that much worse

2) The horizontal resolution seems to be aprox 1 coordinate jump per mm, that
is a resolution of "1" which is really really bad, unheard of bad really.

I think we should contact synaptics about this and see what they have to say
before we start adding some sort of kludge for this to libinput.

Regards,

Hans

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