[Wayland-bugs] [Bug 95514] enable click and tap on logitech K400 plus touchpad keyboard

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95514

--- Comment #4 from Peter Hutterer <peter.hutterer at who-t.net> ---
this isn't a libinput issue and I wonder whether this ever worked in synaptics
because this thing doesn't actually look like a touchpad (and never has, if my
memory serves me right because we never figured out the magic sequence to
switch it to touchpad mode).

the device looks like a normal mouse (REL_X, REL_Y) rather than touchpads'
absolute ABS_X/ABS_Y or ABS_MT_POSITION_X/ABS_MT_POSITION_Y on
multitouch-capable devices. since these trigger the ID_INPUT_TOUCHPAD udev tag
that we use to match for synaptics I doubt this device was ever
synaptics-controlled. evdev would've been the fallback but it doesn't support
tapping. so yeah, I doubt this really ever worked as a touchpad.

note that in the evemu output you posted there are no tapping events, only the
ctrl+c to cancel evemu is visible.

so basically: this device works as expected, though it doesn't work like a
touchpad because we don't have the magic codes to make it look like a touchpad
and thus rely on the firmware.

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