[Wayland-bugs] [Bug 106425] Touchpad jitter on Dell Latitude E7240 with 1.10.6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106425

Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |MOVED

--- Comment #3 from Peter Hutterer <peter.hutterer at who-t.net> ---
The match string is best shortened to:

evdev:name:AlpsPS/2 ALPS GlidePoint:dmi:*svnDellInc.:pnLatitudeE7240:*

and then the EVDEV_ABS lines that you cut from the output, that should fix the
10mm mismatch for the vertical dimension.

This is a semi-mt touchpad too, so I think you're best off just using a fuzz of
8 here and accept that you need it. These touchpads are all terrible anyway,
putting more code into libinput to have heuristics here wouldn't make much
sense tbh. The EVDEV_ABS line looked roughly like this:
 EVDEV_ABS_00=104:1954:30

to add the fuzz of 8 to it, you append a :8
 EVDEV_ABS_00=104:1954:30:8

Replace the first three numbers with the one from the touchpad-edge-detector
and do the same for the other overrides it spits out. Then look at
60-evdev.hwdb for instructions how to install and test this locally. Once done,
reboot, test, if it works you should submit this as a PR to the systemd repo on
github.

Oh, and check for any typos in my suggestions, just in case :)

I'm closing this on the optimistic assumption that it'll all magically work
once this is in place ;)

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