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bab4ca0274
We currently used 0.5mm on touchpads as hysteresis value. This causes pointer
movement delays, it is likely too high. Reduce it to a kernel-set fuzz value
(if any) and see how we go with that. On many touchpads, the fuzz is 8 which
would be closer to 0.2mm on e.g. a T440.
Note that the does some defuzzing anyway, but the response of that function is
nonlinear, e.g. for a fuzz of 8, the physical deltas map to:
phys 0..3 → delta 0
phys 4..7 → delta 1
phys 8..15 → delta 4, 5, 6, 7
phys 16..N → delta 16..N
In other words, we never see some logical deltas 2 and 3. While this shouldn't
matter given the average touchpad resolution, reducing the hysteresis margin
is likely to provide some better response. We never see values 8-15 either
which could be the cause of some pointer jumps we've been seeing.
see https://bugs.freedesktop.org/show_bug.cgi?id=105303
Devices with a fuzz of 0 have the hysteresis margin reduced to 0.25mm (from
0.5mm).
https://bugs.freedesktop.org/show_bug.cgi?id=105108
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
(cherry picked from commit
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| .. | ||
| evdev-debounce.c | ||
| evdev-fallback.c | ||
| evdev-fallback.h | ||
| evdev-middle-button.c | ||
| evdev-mt-touchpad-buttons.c | ||
| evdev-mt-touchpad-edge-scroll.c | ||
| evdev-mt-touchpad-gestures.c | ||
| evdev-mt-touchpad-tap.c | ||
| evdev-mt-touchpad.c | ||
| evdev-mt-touchpad.h | ||
| evdev-tablet-pad-leds.c | ||
| evdev-tablet-pad.c | ||
| evdev-tablet-pad.h | ||
| evdev-tablet.c | ||
| evdev-tablet.h | ||
| evdev.c | ||
| evdev.h | ||
| filter-private.h | ||
| filter.c | ||
| filter.h | ||
| libinput-private.h | ||
| libinput-restore-selinux-context.sh | ||
| libinput-uninstalled.pc.in | ||
| libinput-util.c | ||
| libinput-util.h | ||
| libinput-version.h.in | ||
| libinput.c | ||
| libinput.h | ||
| libinput.pc.in | ||
| libinput.sym | ||
| path-seat.c | ||
| path-seat.h | ||
| timer.c | ||
| timer.h | ||
| udev-seat.c | ||
| udev-seat.h | ||