Comment 30 for bug 159594

if i interpret correctly this results in disabling compiz, which can be achieved by disabling visual effects in the appearance properties as well.

additionally it has been suggested:

"Run a full complex pass of memtest and also a stress testing application for the CPU / CACHE and GPU.

If the hardware proves itself to be reliable under stress tests, I would suggest he considers a clean, fresh install of the latest Hardy point release and see if the problem still replicates itself. If it does, steps to replicate the problem need to be narrowed down."