[Wayland-bugs] [Bug 100413] Unwanted double tap (right click) with one finger

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100413

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

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

--- Comment #3 from Peter Hutterer <peter.hutterer at who-t.net> ---
fyi, evemu-record has a --autorestart=X option that creates a new file after X
seconds of inactivity. Makes the recordings shorter, 65000 lines of event log
is a bit long to sift through.

anyway, a two-finger event first appears at timestamp 305.372914. A second
finger is detected, then moves independently of the first finger. This looks
like a normal event sequence. 307.037204 and 324.239153 are the same. In all
three cases, the sequence looks correct, a second touch lands, both move a bit,
then one or both are released. The only hint I have here that some thing *may*
be wrong is that in all three cases, both fingers are released within the same
or across two event frames.

However, this is not something that's detectable, this is normal touchpad
interaction. In all three cases, the x/y coordinates of the two touches are
distant enough so they appear as two fingers. In other words - there's no way I
can see how I could detect this without disabling two-finger interaction
altogether.

This *may* be fixable in the kernel if the touchpad has some tuning parameters,
but I doubt it. You can try, as root, by running:
echo 1 > /sys/class/input/event4/device/device/calibrate
(and don't touch the touchpad until complete, takes a second or so I think)

Note, that syspath might be wrong, swap event4 for your touchpad and dig around
for the calibrate attribute.

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