My Serval laptop (vendor's, System76's, website no longer has info) has suddenly started immediate turn-off power recently. It's happened at least twice in last 2 days. Any idea is appreciated and please tell me which log files you need to investigate so that I'm happy to provide those.

I can only describe the situation non-numerically b/c I didn't record anything when it occurred but:

• CPU usage is high due to the app I started (roughly, the usage of all 4 cores is more than 75%, less than 100% on Gnome System Monitor)


• Application program running was a simulator for robotics (called Gazebo), which after a few minutes of running the phenomenon occurs. I've used the same tool before on this machine so shouldn't be the matter.


• Noise of the fan was the one of the busiest


• Memory usage was about 50%

Not sure if it's related but after I've upgraded to Precise, the fan has been making more noise even when the CPU usage is very low.

Environment: Ubuntu 12.04 (originally 11.04 upon purchase, then 11.10), Kernel 3.2.0-30-generic, Core i7 2GHz x 8, 11.7GB RAM, GeForce GTX 560M

Thanks.