check input device ID:

　　xinput list　　　　　　;by this you should remeber vitual core keyboard ID(master ID, 3 in my laptop), and AT keyboard ID(13 in my laptop).

Disable:

　　xinput float $(ATkeyboard ID)　　　　　　;command as "xinput float 13" for me.

Enable:

　　xinput reattach $(AT keyboard ID) $(master ID)　　　　;command as "xinput reattach 13 3" for me.

Disable laptop build-in