在我的 Dell Latitude 4590 上，触摸板下方的两个按钮不起作用。
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ PixArt USB Optical Mouse id=11 [slave pointer (2)]
⎜ ↳ DELL0816:00 044E:120A Mouse id=12 [slave pointer (2)]
⎜ ↳ DELL0816:00 044E:120A Touchpad id=13 [slave pointer (2)] <-- of interest
⎣ 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)]
↳ Power Button id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ Integrated_Webcam_HD: Integrate id=10 [slave keyboard (3)]
↳ DELL0816:00 044E:120A UNKNOWN id=14 [slave keyboard (3)]
↳ Intel HID events id=15 [slave keyboard (3)]
↳ Intel HID 5 button array id=16 [slave keyboard (3)]
↳ Dell WMI hotkeys id=17 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=18 [slave keyboard (3)]
其属性为：
$ xinput list-props 13
Device 'DELL0816:00 044E:120A Touchpad':
Device Enabled (184): 1
Coordinate Transformation Matrix (186): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (318): 1
Device Accel Constant Deceleration (319): 2.500000
Device Accel Adaptive Deceleration (320): 1.000000
Device Accel Velocity Scaling (321): 11.672794
Synaptics Edges (343): 47, 1152, 34, 601
Synaptics Finger (344): 25, 30, 0
Synaptics Tap Time (345): 180
Synaptics Tap Move (346): 59
Synaptics Tap Durations (347): 180, 180, 100
Synaptics ClickPad (348): 0
Synaptics Middle Button Timeout (349): 75
Synaptics Two-Finger Pressure (350): 282
Synaptics Two-Finger Width (351): 7
Synaptics Scrolling Distance (352): -27, 27
Synaptics Edge Scrolling (353): 0, 0, 0
Synaptics Two-Finger Scrolling (354): 1, 1
Synaptics Move Speed (355): 1.000000, 1.750000, 0.147493, 0.000000
Synaptics Off (356): 0
Synaptics Locked Drags (357): 0
Synaptics Locked Drags Timeout (358): 5000
Synaptics Tap Action (359): 0, 0, 0, 0, 1, 0, 0
Synaptics Click Action (360): 1, 0, 0
Synaptics Circular Scrolling (361): 0
Synaptics Circular Scrolling Distance (362): 0.100000
Synaptics Circular Scrolling Trigger (363): 0
Synaptics Circular Pad (364): 0
Synaptics Palm Detection (365): 1
Synaptics Palm Dimensions (366): 10, 200
Synaptics Coasting Speed (367): 20.000000, 50.000000
Synaptics Pressure Motion (368): 30, 160
Synaptics Pressure Motion Factor (369): 1.000000, 1.000000
Synaptics Grab Event Device (370): 0
Synaptics Gestures (371): 1
Synaptics Capabilities (372): 1, 0, 1, 1, 1, 0, 0
Synaptics Pad Resolution (373): 12, 12
Synaptics Area (374): 0, 0, 0, 0
Synaptics Noise Cancellation (375): 6, 6
Device Product ID (311): 1102, 4618
Device Node (310): "/dev/input/event12"
奇怪的是没有事件是在我点击使用 检查的触摸板下方的两个按钮时生成的xev。