用命令行的话，先
xinput listblair@blair-PC:~$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ 2.4G Mouse id=10 [slave pointer (2)]
⎜ ↳ ITE Tech. Inc. ITE Device(8910) Consumer Control id=13 [slave pointer (2)]
⎜ ↳ MSFT0001:00 04F3:31DD Mouse id=17 [slave pointer (2)]
⎜ ↳ MSFT0001:00 04F3:31DD Touchpad id=18 [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)]
↳ Integrated Camera: Integrated C id=11 [slave keyboard (3)]
↳ ITE Tech. Inc. ITE Device(8910) Keyboard id=12 [slave keyboard (3)]
↳ ITE Tech. Inc. ITE Device(8910) Wireless Radio Control id=14 [slave keyboard (3)]
↳ ITE Tech. Inc. ITE Device(8910) System Control id=15 [slave keyboard (3)]
↳ Ideapad extra buttons id=16 [slave keyboard (3)]
↳ AT Raw Set 2 keyboard id=19 [slave keyboard (3)]
↳ ITE Tech. Inc. ITE Device(8910) Consumer Control id=20 [slave keyboard (3)]
找到触摸板的id，然后
xinput set-prop 触摸板ID "Device Enabled" 0最后的0改成1可以重新启用