archllinux配置触摸板

参考：https://www.jianshu.com/p/c5678ce41ab1——作者：BigTaiYang大太阳

　　　　https://wiki.archlinuxcn.org/wiki/Libinput

sudo cp /usr/share/X11/xorg.conf.d/70-synaptics.conf  /etc/X11/xorg.conf.d/

修改内容如下：

/etc/X11/xorg.conf.d $ cat 70-synaptics.conf 
Section "InputClass"
        Identifier "touchpad"
        Driver "synaptics"
        MatchIsTouchpad "on"
                Option "TapButton1" "1"
                Option "TapButton2" "3"
                Option "TapButton3" "0"
                Option "VertEdgeScroll" "on"
                Option "VertTwoFingerScroll" "on"
                Option "HorizEdgeScroll" "on"
                Option "HorizTwoFingerScroll" "on"
                Option "VertScrollDelta" "-112"
                Option "HorizScrollDelta" "-114"
                Option "MaxTapTime" "125"
EndSection

以上配置的默认触摸板行为：

1. 单指轻触：左键
2. 双指轻触：右键
3. 禁用三指轻触
4. 启用边缘和双指滚动
5. 启用自然滚动
6. 触击最大时间 125ms

更多配置项请参考man synaptics