I've used Ubuntu (Jaunty / 9.04 is the version in question) in my development laptop for last two years. For two days my CPU constantly has 100% usage. I can see in "htop" and "gnome-system-monitor" that Firefox 3.5 and Xorg is competing at the top for CPU resource. If I kill Firefox, the CPU usage still remains at 100%, so I don't think it's Firefox causing this. I tried restarting a few times but that didn't help either. My development experience has been very bad for last two days.
I not aware of anything particular that I did which may have caused this problem. I applied a few system updates as they became available in the last few days.
What procedure should I follow to find out what is causing this 100% CPU usage constantly for two days? Or if you already know the problem, please suggest.
The problem is related to Gnome and not Firefox or Compiz. Here is a screen-shot of "htop" with compiz, Firefox and almost all of the usual system-tray programs killed. You can see, it is still at 100%, but apparently no program is eating that much resource. The CPU temperature reaches 90 degrees after some time.
I am now using XFCE and everything is great.
Failsafe Gnome also does NOT solve the problem. Failsafe terminal DOES. Any ideas what is causing this?