http://askubuntu.com/questions/292535/how-to-get-caps-num-scroll-lock-keys-osd-notification
sudo add-apt-repository ppa:tsbarnes/indicator-keylock sudo apt-get update sudo apt-get install indicator-keylock setsid indicator-keylock # to run it the first time |
http://blog.csdn.net/zhengkarl/article/details/12324879