My machine is a Lenovo G580 with these specifications:
- Processor: intel core i7 3520M
- Graphics: intel core HD graphics 4000 + nvidia Geforce 710M
- RAM: 6GB
I'm on ubuntu 13.04 64 bits and I've set up bumblebee.
The computer gets too heat (more than 70ºc) when I leave the cpufreq in "ondemand" mode and it shouldn't since I'm not doing too intensity-CPU stuff.
I think that it's due to excessive use of intel hd graphics for rendering the screen, because if i put the frequency to 2.9GHz, the temperature is still ok; but I leave the cpufreq to switch the cpu freq, it warms up.
A workaround could use the nvidia graphics card for unity and firefox (things I've always opened), something I don't know how to do it.
Also, i would like to know if, eventually, the optimus nvidia technology (to change automatically from integrated to dedicated GPUs depending on the current graphics/video use.) it's going to be supported in Linux, either proprietary or open source way.