FAQ which links to passionate explanation about what libinput is not
Beget by gnome I believe?
Ubuntu: pointer speed, natural scrolling, two finger scrolling, edge scrolling, tap to click
Find settings in /usr/share/X11/xorg.conf.d/ or /etc/X11/xorg.conf.d/
All the stuff touchpad.c does, and
Graphical interface to modify options
Mechanism: uncertain. Does it just insert events into an output stream? Or does it translate events to some other format?
evdev-mt-touchpad.c: 4000 lines. Moderate activity.
libinput.c: 4000 lines. 😱 Seen considerably less action than quirks.c over the past year.
evdev.c: 3000 lines. Moderate activity. Commit messages reminiscent of quirks (e.g., device-specific)
quirks.c: 1500 lines. Reasonably active file, with shared purpose not very clear, but possibly to implement one-off features for certain input devices?
Less than 1000: evdev-debounce.c, libinput-util.c, evdev-middle-button.c,
Less than 500: timer.c, path-seat.c, filter-tablet.c,
Seems used to connect kernel to libinput
(Partially?) maintained by Peter
Touchpad.c (3500 lines, of which ~1200 were skimmed to compile these lists) as implemented by by libinput implies the scope as:
Detect "fake finger" presses, palm detection
Decide when a touch is ended/started
Abstract away cursor jitter (tp_detect_wobbling)
Process "finger sets", aka multitouch
Trackpoint triggering (i.e., two finger scrolling?)
tp_palm_detect_move_out_of_edge
Weird shit
tp_restore_synaptics_touches
tp_process_fake_touches
tp_unpin_finger
tp_palm_was_in_side_edge
tp_palm_tap_is_palm
Misc