Trackpad avec 2 doigts

1. Use the Terminal to enable proper scrolling behavior.

If you have just transferred your software and data to a new MacBook or MacBook Pro and are having troubles with two-finger gestures, then entering the following command in the Terminal should re-enable it:

defaults write -g com.apple.trackpad.scrollBehavior 2
After entering this command, either restart the computer or log out and log back in for the changes to take effect.