在系统账户登陆前触摸版就不能使用，但是可以Fn+F7开启或者关闭，开启后仍不能使用，一点反应都没有。
用xinput 查看一下触摸板的名称，执行 xinput list 得出结果如下
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ GASIA USB KB V11 id=12 [slave pointer (2)]
⎜ ↳ SIGMACHIP Usb Mouse id=14 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=16 [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)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Power Button id=9 [slave keyboard (3)]
↳ Sleep Button id=10 [slave keyboard (3)]
↳ GASIA USB KB V11 id=11 [slave keyboard (3)]
↳ HD Webcam id=13 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=15 [slave keyboard (3)]
↳ Acer WMI hotkeys id=17 [slave keyboard (3)]
从上面结果，可以看出触摸板名称为"SynPS/2 Synaptics TouchPad"，id为16。
再通过 xinput list-props 16 查看触摸板所有相关属性，结果大致如下：
Device 'SynPS/2 Synaptics TouchPad':
Device Enabled (132): 1
Coordinate Transformation Matrix (134): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (257): 1
Device Accel Constant Deceleration (258): 2.500000
Device Accel Adaptive Deceleration (259): 1.000000
Device Accel Velocity Scaling (260): 12.500000
Synaptics Edges (281): 1490, 5452, 1170, 4738
Synaptics Finger (282): 25, 30, 256
Synaptics Tap Time (283): 180
Synaptics Tap Move (284): 272
Synaptics Tap Durations (285): 180, 180, 100
Synaptics ClickPad (286): 0
Synaptics Tap FastTap (287): 0
Synaptics Middle Button Timeout (288): 75
Synaptics Two-Finger Pressure (289): 282
Synaptics Two-Finger Width (290): 7
Synaptics Scrolling Distance (291): 123, 123
Synaptics Edge Scrolling (292): 0, 0, 0
Synaptics Two-Finger Scrolling (293): 1, 0
Synaptics Move Speed (294): 1.000000, 1.750000, 0.032268, 40.000000
Synaptics Edge Motion Pressure (295): 30, 160
Synaptics Edge Motion Speed (296): 1, 495
Synaptics Edge Motion Always (297): 0
Synaptics Off (298): 2
Synaptics Locked Drags (299): 0
Synaptics Locked Drags Timeout (300): 5000
Synaptics Tap Action (301): 2, 3, 0, 0, 1, 3, 0
Synaptics Click Action (302): 1, 1, 0
Synaptics Circular Scrolling (303): 0
Synaptics Circular Scrolling Distance (304): 0.100000
Synaptics Circular Scrolling Trigger (305): 0
Synaptics Circular Pad (306): 0
Synaptics Palm Detection (307): 0
Synaptics Palm Dimensions (308): 10, 200
Synaptics Coasting Speed (309): 20.000000, 50.000000
Synaptics Pressure Motion (310): ... of unknown type CARDINAL
Synaptics Pressure Motion Factor (311): 1.000000, 1.000000
Synaptics Resolution Detect (312): 1
Synaptics Grab Event Device (313): 1
Synaptics Gestures (314): 1
Synaptics Capabilities (315): 1, 0, 1, 1, 1, 1, 1
Synaptics Pad Resolution (316): 105, 55
Synaptics Area (317): 0, 0, 0, 0
Synaptics Noise Cancellation (318): 8, 8
Device Product ID (251): 2, 7
Device Node (252): "/dev/input/event10"
其中“Device Enabled (132)”就是用来控制是否开启的，值 0：代表禁用，1：代表启用。
可以看到明明也启用了
网上说可以用下面的命令解决
modprobe -r psmouse
modprobe psmouse proto=imps
再次启用后，触摸板仍然不能使用。
求各位大神相助！！！
终于解决了……