https://bugs.freedesktop.org/show_bug.cgi?id=89725
--- Comment #9 from Hans de Goede <[email protected]> --- 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 -- You are receiving this mail because: You are the assignee for the bug.
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