第一步，先确定触控屏的ID号，我这里的ID是11。可以通过多次插拔配合使用xinput命令来看哪个设备不在列表里确定该设备的ID号。
ttt@ttt:~$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ MOSART Semi. thinkplus WL80 Mouse - Receiver Mouse id=12 [slave pointer (2)]
⎜ ↳ MOSART Semi. thinkplus WL80 Mouse - Receiver Consumer Control id=13 [slave pointer (2)]
⎜ ↳ GXTP5140:00 27C6:01E0 Mouse id=16 [slave pointer (2)]
⎜ ↳ GXTP5140:00 27C6:01E0 Touchpad id=17 [slave pointer (2)]
⎜ ↳ TPPS/2 Synaptics TrackPoint id=19 [slave pointer (2)]
⎜ ↳ UsbHID SingWon-CTP-V1.18A id=11 [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)]
↳ Power Button id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ MOSART Semi. thinkplus WL80 Mouse - Receiver System Control id=14 [slave keyboard (3)]
↳ Integrated Camera: Integrated C id=15 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=18 [slave keyboard (3)]
↳ ThinkPad Extra Buttons id=20 [slave keyboard (3)]
↳ MOSART Semi. thinkplus WL80 Mouse - Receiver Consumer Control id=21 [slave keyboard (3)]
↳ UsbHID SingWon-CTP-V1.18A id=10 [slave keyboard (3)]
第二步，确定触控屏的名称，我这里的名称是DisplayPort-0。
ttt@ttt:~$ xrandr
Screen 0: minimum 320 x 200, current 3520 x 1080, maximum 16384 x 16384
eDP connected primary 1920x1080+1600+0 (normal left inverted right x axis y axis) 309mm x 174mm
1920x1080 59.98*+
1680x1050 59.98
1280x1024 59.98
1440x900 59.98
1280x800 59.98
1280x720 59.98
1024x768 59.98
800x600 59.98
640x480 59.98
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-0 connected 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
1600x900 60.01*+
1920x1080 60.00 60.00 50.00 59.94
1680x1050 59.95
1440x900 59.89
1280x960 60.00
1280x800 59.81
1280x720 48.00 47.95 60.00 50.00 59.94
1024x768 60.00
800x600 60.32 56.25
640x480 60.00 59.94
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
第三步，重新映射
xinput map-to-output 11 DisplayPort-0
命令格式为：xinput map-to-output $触控屏ID $触控屏名称