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.
--
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:
sudo add-apt-repository ppa:bumblebee/stable
sudo apt-get update
sudo apt-get install bumblebee bumblebee-nvidia linux-headers-generic
After that, reboot, and your laptop will use the low-power integrated graphics chipset and leave your dedicated GPU powered off.
You can always start an application that requires your full GPU power by running it "with bumblebee":
optirun your-application
--
Should you run into trouble after the installation, the following page might help you: https://github.com/Bumblebee-Project/Bumblebee/wiki/Troubleshooting
My laptop had the same problem after a reinstall. In my case it turned out that somehow the cpufrequtils package wasn't installed and my processor were running amok.
Also cleaning the fan from dust reduced its temp by another 10 degrees or so.
PS: Just installing cpufrequtils does nothing, nor is it installed by default. After the installation, the user get two tools - cpufre-info, to get info about frequencies and governors, and cpufreq-set to manage these parameters.
I had the same problem with Ubuntu. I have Intel I7 10th gen, 12gb sdram, GEforce GTX 400 with MaxQ and 6gb vram. My laptop ran incredibly hot. I started with default linux video driver, tried the Nvidia drivers from Linux repository, then tried dedicated driver from Nvidia. None of that solved my problem. I took Ubuntu off and switched to Fedora and it works fine in Fedora with the Nvidia driver from Linux system.
