I also have this problem. My solution is to install old nvidia drivers. This sound stupid, but it's a solution.
I used Envy (http://albertomilone.com/) to install old drivers (96.43.01). Now system works great. Now I turned on powernowd, compiz. Firefox also works great. -- System freezes (possibly Gecko) https://bugs.launchpad.net/bugs/107093 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
