On my laptop, whenever the computer is idle a period of time (10 minutes I think) the monitor shuts off. At this time the cpu usage spikes, I know this because the fan starts going crazy. When I move the mouse, the process immediately dies and cpu usage returns to normal.
I've tried to monitor what is running using htop and it appears to be compiz, but this could be an artifact of waking up and not what is causing the problem.
I'm running Ubuntu 12.04 and have an ATI graphics card (5400 series I believe). I'm fairly certain the drivers are up to date.
My question: How can I find out what is running? or How can I fix this problem?