I've installed Xubuntu 14.04 on my macbook 2,1 in April when it was released, and everything was working fine. But since a few weeks, The touchpad pointer start to freeze after entering session in xubuntu (between 30 seconds to some minutes after opening session, randomly).
To make it work again, I switch to tty1 and I execute:
sudo rmmod appletouch
sudo modprobe appletouch
And then it works perfectly (I never had to do it twice).

Do you know if there is some kind of log from appletouch driver ? I checked kernel.log but i didn't see anything.
Am I the only one with this problem ? Any suggestions for an easier workaround ?
Thanks !