问Thinkpad跟踪点滚动速度

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如何改变跟踪点滚动速度？这是减缓的方法(T480s +Ubuntu18.04)。鼠标速度设置似乎工作良好，鼠标速度是合适的，但它根本不影响滚动速度。另外，由于某些原因，我没有xinput速度和灵敏度参数(用于尝试配置Thinkpad的TrackPoint的最佳方法是什么？解决方案)。

/sys/devices/platform/i8042/serio1$ xinput --list ⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ ETPS/2 Elantech Touchpad id=12 [slave pointer (2)] ⎜ ↳ ETPS/2 Elantech TrackPoint id=13 [slave pointer (2)] ⎣ Virtual core keyboard id=3 [master keyboard (2)] ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)] ↳ Power Button id=6 [slave keyboard (3)] ↳ Video Bus id=7 [slave keyboard (3)] ↳ Sleep Button id=8 [slave keyboard (3)] ↳ Integrated IR Camera: Integrate id=9 [slave keyboard (3)] ↳ Integrated Camera: Integrated C id=10 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)] ↳ ThinkPad Extra Buttons id=14 [slave keyboard (3)]

/sys/devices/platform/i8042/serio1$ xinput --list-props 13 Device 'ETPS/2 Elantech TrackPoint': Device Enabled (142): 1 Coordinate Transformation Matrix (144): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000 libinput Natural Scrolling Enabled (287): 0 libinput Natural Scrolling Enabled Default (288): 0 libinput Scroll Methods Available (291): 0, 0, 1 libinput Scroll Method Enabled (292): 0, 0, 1 libinput Scroll Method Enabled Default (293): 0, 0, 1 libinput Button Scrolling Button (305): 2 libinput Button Scrolling Button Default (306): 2 libinput Middle Emulation Enabled (297): 0 libinput Middle Emulation Enabled Default (298): 0 libinput Accel Speed (299): 1.000000 libinput Accel Speed Default (300): 0.000000 libinput Accel Profiles Available (307): 1, 1 libinput Accel Profile Enabled (308): 1, 0 libinput Accel Profile Enabled Default (309): 1, 0 libinput Left Handed Enabled (301): 0 libinput Left Handed Enabled Default (302): 0 libinput Send Events Modes Available (264): 1, 0 libinput Send Events Mode Enabled (265): 0, 0 libinput Send Events Mode Enabled Default (266): 0, 0 Device Node (267): "/dev/input/event5" Device Product ID (268): 2, 14 libinput Drag Lock Buttons (303): libinput Horizontal Scroll Enabled (304): 1