Why is my laptop running so hot with Ubuntu?

I have pretty decent laptop and should be more than enough for running Ubuntu for browsing and watching movies, but Ubuntu seems to be getting much hotter than it should, compared to Win 7. I'm on Ubuntu 12.10.

I have Asus N53SV. CPU: Intel® Core i7-2630QM RAM: 6GB DDR3 GPU: NVIDIA GeForce GT 540M

Here's picture of XSensor when I have only Firefox open, it should be around 40C so that's 20C more than usual.

Since you have an Optimus-enabled laptop, you'll want to install Bumblebee.

Without Bumblebee, you are most likely using the integrated graphics chipset, while your dedicated graphics card is powered on, which will generate more heat and consume more power.

Moreover, the problem is generally worse when using the open source nVidia driver.

In a nutshell, Bumblebee disables that GPU and allows you to work in a low-power state. It also allows you to use your GPU whenever you need more graphics power.

Windows does this too, automatically, which is why you don't run into the same problem under Windows.

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Before installing Bumblebee, remove any graphics drivers you might have installed.

After that, installation of Bumblebee and the proprietary nVidia driver can be done with the following commands:

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