libinput applies averaging to the velocity of most pointer devices. Averaging
the velocity makes the motion look smooth and may be of benefit to bad input
devices. For good devices, however, it comes at the unfortunate price of
decreased accuaracy.
This change turns velocity averaging off by default (sets ntrackers to 2 instead
of 16) and allows for it to be turned back on via a quirk, for bad devices which
require it.
If the trackpoint gives us deltas with less than 10ms intervals, something is
wrong. Could be bad hardware, a glitch in the matrix or a discontinuity in
the otherwise appropriately named time-space continuum. Usually it's the
first.
Let's always set up trackpoint delta smoothening for 10ms to improve the
pointer speed calculation and avoid jerky behaviors. i.e. if a trackpoint
delta comes in below 10ms, pretend it came in with a 10ms interval for
calculating the speed.
Fixes https://gitlab.freedesktop.org/libinput/libinput/issues/104
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Measuring the trackpoint range has not shown to be sufficient or precise
enough to be used as an ingredient for trackpoint acceleration. So let's just
switch back to a generic multiplier that we can apply to the input deltas do
undo any device-specific lack of scaling.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This gets rid of the trackpoint range propery that we've been parsing until
now and instead just opts for a basic curve with some deceleration for low
pressure. The speed range is taken from the touchpad and should be wide enough
for most trackpoints that fall within the expected range.
Trackpoints like the new ALPS ones need to be configured through a hwdb (this
part is currently missing).
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This raises the trackpoint speed limit to something more conducive to
long-distance moves.
https://bugs.freedesktop.org/show_bug.cgi?id=106506
Signed-off-by: Chow Loong Jin <hyperair@debian.org>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
