系统：Debian Wheezy Xfce。

问题：虽然安装了 Xorg 触摸板输入的驱动(synaptics)，但是“点击”触摸板中间部分，仍然无法启用其相当于鼠标的“单击”功能。

1.首先，保证安装了 synaptics 驱动：

$ sudo apt-get install xserver-xorg-input-synaptics

2.复制 /usr/share/X11/xorg.conf.d 到 /etc/X11

$ sudo cp -R /usr/share/X11/xorg.conf.d/ /etc/X11

3.将原 /etc/X11/xorg.conf.d/10-evdev.conf 配置文件下面同一部分内容改为：

Section "InputClass"          Identifier "evdev touchpad catchall"          MatchIsTouchpad "on"          MatchDevicePath "/dev/input/event*"          Driver "synaptics"          Option "TapButton1" "1"          Option "TapButton2" "2"          Option "TapButton2" "3"  EndSection

关于上面文件中 TapButton 的使用，man 手册里面的解释为

Option "TapButton1" "integer"    Which mouse button is reported on a non-corner one-finger tap.  Set  to    0 to disable. Property: "Synaptics Tap Action" Option "TapButton2" "integer"    Which  mouse button is reported on a non-corner two-finger tap.  Set to    0 to disable. Property: "Synaptics Tap Action"Option "TapButton3" "integer"    Which mouse button is reported on a non-corner three-finger  tap.   Set    to 0 to disable. Property: "Synaptics Tap Action"

4.重启系统