ubuntu 滑鼠靈敏度設定

打開終端機輸入

xinput --list

顯示結果如下，可以看到目前所有的輸入裝置

⎡ Virtual core pointer                     id=2 [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer               id=4 [slave  pointer  (2)]
⎜   ↳ Logitech USB Receiver                    id=12 [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)]
    ↳ Power Button                             id=7 [slave  keyboard (3)]
    ↳ Heng Yu Technology K108D                 id=8 [slave  keyboard (3)]
    ↳ Heng Yu Technology K108D                 id=9 [slave  keyboard (3)]
    ↳ USB2.0 Camera                            id=10 [slave  keyboard (3)]
    ↳ Logitech USB Receiver                    id=11 [slave  keyboard (3)]

要修改的是滑鼠的屬性，所以找尋 Virtual core pointer 下的滑鼠裝置，以我這邊的範例呢是 Ligitech USB Receiver。接著輸入以下指定來看看滑鼠裝置的屬性

xinput --list-props "Logitech USB Receiver"

我這邊因為是使用無線鍵鼠組，一個無線接收器可以收滑鼠跟鍵盤的訊號所以鍵盤、滑鼠都名稱相同，會使程式無法辨認，可改用 id 設定，我的滑鼠 id 為 12，指令如下

xinput --list-props 12

這時候會看到一大串滑鼠的屬性

Device 'Logitech USB Receiver':
 Device Enabled (145): 1
 Coordinate Transformation Matrix (147): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
 Device Accel Profile (275): 0
 Device Accel Constant Deceleration (276): 0.550000
 Device Accel Adaptive Deceleration (277): 1.000000
 Device Accel Velocity Scaling (278): 10.000000
 Device Product ID (262): 1133, 50478
 Device Node (263): "/dev/input/event6"
 Evdev Axis Inversion (279): 0, 0
 Evdev Axes Swap (281): 0
 Axis Labels (282): "Rel X" (155), "Rel Y" (156), "Rel Horiz Wheel" (272), "Rel Dial" (273), "Rel Vert Wheel" (274)
 Button Labels (283): "Button Left" (148), "Button Middle" (149), "Button Right" (150), "Button Wheel Up" (151), "Button Wheel Down" (152), "Button Horiz Wheel Left" (153), "Button Horiz Wheel Right" (154), "Button Side" (267), "Button Extra" (268), "Button Forward" (269), "Button Back" (270), "Button Task" (271), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265), "Button Unknown" (265)
 Evdev Middle Button Emulation (284): 0
 Evdev Middle Button Timeout (285): 50
 Evdev Third Button Emulation (286): 0
 Evdev Third Button Emulation Timeout (287): 1000
 Evdev Third Button Emulation Button (288): 3
 Evdev Third Button Emulation Threshold (289): 20
 Evdev Wheel Emulation (290): 0
 Evdev Wheel Emulation Axes (291): 0, 0, 4, 5
 Evdev Wheel Emulation Inertia (292): 10
 Evdev Wheel Emulation Timeout (293): 200
 Evdev Wheel Emulation Button (294): 4
 Evdev Drag Lock Buttons (295): 0

影響滑鼠靈敏度的屬性是 Device Accel Constant Deceleration，有點算是移動阻力的意思，數值愈大移動愈慢反之移動愈快。而設定屬性的方法如下，這裡我把它設定為 0.55

xinput --set-prop 12 "Device Accel Constant Deceleration" 0.55

或者也可以用屬性的編號

xinput --set-prop 12 276 0.55

修改完後再次輸入查看滑鼠屬性的指令就會發現 Device Accel Constant Deceleration 變成 0.55 了。

Reference

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