对于 xinput 的 libinput 属性，名称中带有 default 的和不带有 default 的有什么区别？

Question

我xinput list-props "ETPS/2 Elantech Touchpad"的输出是

Device 'ETPS/2 Elantech Touchpad':
    Device Enabled (139):   1
    Coordinate Transformation Matrix (141): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
    libinput Tapping Enabled (276): 0
    libinput Tapping Enabled Default (277): 0
    libinput Tapping Drag Enabled (278):    1
    libinput Tapping Drag Enabled Default (279):    1
    libinput Tapping Drag Lock Enabled (280):   0
    libinput Tapping Drag Lock Enabled Default (281):   0
    libinput Tapping Button Mapping Enabled (282):  1, 0
    libinput Tapping Button Mapping Default (283):  1, 0
    libinput Accel Speed (284): 0.000000
    libinput Accel Speed Default (285): 0.000000
    libinput Natural Scrolling Enabled (286):   0
    libinput Natural Scrolling Enabled Default (287):   0
    libinput Send Events Modes Available (261): 1, 1
    libinput Send Events Mode Enabled (262):    0, 0
    libinput Send Events Mode Enabled Default (263):    0, 0
    libinput Left Handed Enabled (288): 0
    libinput Left Handed Enabled Default (289): 0
    libinput Scroll Methods Available (290):    1, 1, 0
    libinput Scroll Method Enabled (291):   1, 0, 0
    libinput Scroll Method Enabled Default (292):   1, 0, 0
    libinput Disable While Typing Enabled (293):    1
    libinput Disable While Typing Enabled Default (294):    1
    Device Node (264):  "/dev/input/event5"
    Device Product ID (265):    2, 14
    libinput Drag Lock Buttons (295):   <no items>
    libinput Horizontal Scroll Enabled (296):   1

那么libinput Tapping Enabled和之间有什么区别libinput Tapping Enabled Default？在这种情况下默认是什么意思？我用它来设置我的 i3 触摸板。

Answer 1

xf86-input-libinput 使用这些只读属性来报告默认值libinput 将用于此特定设备，因此允许 UI 和控制面板正确重置参数，而不必在所有系统和设备上假设单一默认值（或重复 libinput 的逻辑）。