更新后，我的触摸板部分停止工作。我有一台 Thinkpad T440s。我可以使用指点杆，只能使用触摸板进行左键单击。
xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ MOSART Semi. 2.4G Wireless Mouse id=9 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=12 [slave pointer (2)]
⎜ ↳ TPPS/2 IBM TrackPoint id=14 [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 Camera id=10 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)]
↳ ThinkPad Extra Buttons id=13 [slave keyboard (3)]
xinput list-props 12
Device 'SynPS/2 Synaptics TouchPad':
Device Enabled (136): 1
Coordinate Transformation Matrix (138): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (261): 0
Device Accel Constant Deceleration (262): 1.000000
Device Accel Adaptive Deceleration (263): 1.000000
Device Accel Velocity Scaling (264): 10.000000
Device Product ID (253): 2, 7
Device Node (254): "/dev/input/event5"
Evdev Axis Inversion (265): 0, 0
Evdev Axis Calibration (266): <no items>
Evdev Axes Swap (267): 0
Axis Labels (268): "Abs MT Position X" (287), "Abs MT Position Y" (288), "Abs MT Pressure" (289), "Abs Tool Width" (286), "None" (0), "None" (0), "None" (0)
Button Labels (269): "Button Left" (139), "Button Unknown" (256), "Button Unknown" (256), "Button Wheel Up" (142), "Button Wheel Down" (143)
Evdev Scrolling Distance (270): 0, 0, 0
Evdev Middle Button Emulation (271): 0
Evdev Middle Button Timeout (272): 50
Evdev Third Button Emulation (273): 0
Evdev Third Button Emulation Timeout (274): 1000
Evdev Third Button Emulation Button (275): 3
Evdev Third Button Emulation Threshold (276): 20
Evdev Wheel Emulation (277): 0
Evdev Wheel Emulation Axes (278): 0, 0, 4, 5
Evdev Wheel Emulation Inertia (279): 10
Evdev Wheel Emulation Timeout (280): 200
Evdev Wheel Emulation Button (281): 4
Evdev Drag Lock Buttons (282): 0
我不知道如何开始调试。如能得到任何帮助，我将不胜感激。我运行的是 14.04