仔细查阅了以前的档案以寻找解决方案，但都不起作用。操作系统，Ubuntu 16.04.3 TLS，硬件 ACER Aspire LT 型号 V3-471G，BIOS 版本 1.18，处理器 i5-3210m，2.5 GHz。我没有使用外接鼠标，但只想使用触摸板。安装过程很顺利，这是一个全新的安装，而不是升级。除了触摸板，一切都正常。
尝试了之前提供的各种选项，例如安装 synaptics、修改 90-synaptics.conf 等。但都不起作用。安装 synaptics 使情况变得更糟，键盘输入停止工作。BIOS 也没有任何选项可以从高级触摸板切换到基本触摸板。
$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ETPS/2 Elantech Touchpad 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)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Power Button id=9 [slave keyboard (3)]
↳ Sleep Button id=10 [slave keyboard (3)]
↳ HD WebCam id=11 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=12 [slave keyboard (3)]
↳ Acer WMI hotkeys id=14 [slave keyboard (3)]
$ uname -a
Linux roblox-Aspire-V3-471G 4.10.0-30-generic #34~16.04.1-Ubuntu SMP Wed Aug 2 02:14:26 UTC 2017 i686 i686 i686 GNU/Linux
$ xinput list-props 13
Device 'ETPS/2 Elantech Touchpad':
Device Enabled (154): 1
Coordinate Transformation Matrix (156): 1.000000, 0.000000, 0.000000, 0.
000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (277): 1
Device Accel Constant Deceleration (278): 2.500000
Device Accel Adaptive Deceleration (279): 1.000000
Device Accel Velocity Scaling (280): 12.500000
Synaptics Edges (281): 112, 2688, 68, 1192
Synaptics Finger (282): 1, 1, 0
Synaptics Tap Time (283): 180
Synaptics Tap Move (284): 135
Synaptics Tap Durations (285): 180, 180, 100
Synaptics ClickPad (286): 0
Synaptics Middle Button Timeout (287): 75
Synaptics Two-Finger Pressure (288): 282
Synaptics Two-Finger Width (289): 7
Synaptics Scrolling Distance (290): 61, 61
Synaptics Edge Scrolling (291): 0, 0, 0
Synaptics Two-Finger Scrolling (292): 1, 1
Synaptics Move Speed (293): 1.000000, 1.750000, 0.065147, 0.000000
Synaptics Off (294): 2
Synaptics Locked Drags (295): 0
Synaptics Locked Drags Timeout (296): 5000
Synaptics Tap Action (297): 2, 3, 0, 0, 1, 3, 0
Synaptics Click Action (298): 1, 1, 0
Synaptics Circular Scrolling (299): 0
Synaptics Circular Scrolling Distance (300): 0.100000
Synaptics Circular Scrolling Trigger (301): 0
Synaptics Circular Pad (302): 0
Synaptics Palm Detection (303): 0
Synaptics Palm Dimensions (304): 10, 200
Synaptics Coasting Speed (305): 20.000000, 50.000000
Synaptics Pressure Motion (306): 30, 160
Synaptics Pressure Motion Factor (307): 1.000000, 1.000000
Synaptics Resolution Detect (308): 1
Synaptics Grab Event Device (309): 0
Synaptics Gestures (310): 1
Synaptics Capabilities (311): 1, 0, 1, 1, 1, 1, 1
Synaptics Pad Resolution (312): 31, 31
Synaptics Area (313): 0, 0, 0, 0
Synaptics Noise Cancellation (314): 15, 15
Device Product ID (272): 2, 14
Device Node (273): "/dev/input/event7"
答案1
现在这个问题已经解决了。启动后，我只需按下 Fn+F7 即可让触摸板工作。但是，每次重启后我都需要这样做，更改不是持久的。哦，好吧，我必须学会忍受这一点。感谢所有提出各种建议的人。