原来是这样的：

QUOTE:

Section "InputDevice" Identifier "Synaptics" Driver "synaptics" Option "Device" "/dev/input/mice" Option "Protocol" "auto-dev" Option "Emulate3Buttons" "yes" EndSection Section "InputDevice" Identifier "Synaptics" Driver "synaptics" Option "Device" "/dev/input/mice" Option "Protocol" "auto-dev" Option "Emulate3Buttons" "yes" EndSection

添加两行参数

QUOTE:

Option "TapButton1" "1" Option "TapButton2" "2" Option "TapButton1" "1" Option "TapButton2" "2"

改成这样就可以了。

QUOTE:

Section "InputDevice" Identifier "Synaptics" Driver "synaptics" Option "Device" "/dev/input/mice" Option "Protocol" "auto-dev" Option "Emulate3Buttons" "yes" Option "TapButton1" "1" Option "TapButton2" "2" EndSection