Trackpoint 小红点

https://askubuntu.com/questions/37824/what-is-the-best-way-to-configure-a-thinkpads-trackpoint

/etc/udev/rules.d/10-trackpoint.rules

SUBSYSTEM=="serio", DRIVERS=="psmouse", DEVPATH=="/sys/devices/platform/i8042/serio1/serio2", ATTR{sensitivity}="160", ATTR{speed}="40"