I am running Ubuntu 12.04 on a 2011 macbook air.

I have noticed over the last month that the trackpad does not always seem to load at startup. I can log in ok, and the 'pointer' will appear on the screen, but will not respond to any touches, etc.
To make matters more confusing, this does not happen consistently. It seems to happen approximately 1/3 of the time. When it happens, it typically requires two reboots to get the system to boot (load/start up the trackpad) properly.

Any thoughts? I'm not sure where to look (or if I should be looking) in the log files for answers.