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I recently installed Ubuntu 12.10 on my hp dv4-5110tx laptop. It has Intel HD 400 and nvidia geforce gt 630m with optimus gpus.My laptop remain cool most of the time when i use windows 7 but when i start using ubuntu, it's temperature increases a lot. Now i am concerned about it. What is the solution for this ? Is this normal ? or do i have to install any driver?

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The Nvidia power usage isn't that well optimized in the Linux driver. Can you try to disable the Nvidia GPU in your BIOS to verify the cause? – gertvdijk Jan 15 '13 at 15:23

If your system has duel graphics card and optimus enabled you need to turn off the discrete graphics card. Otherwise both are enabled and lead to high temperature.

Instruction for installing Bumblebee to turn off discrete GPU and enable only when required

Ubuntu docs link for updated info

  1. Type the following in terminal,

    sudo add-apt-repository ppa:bumblebee/stable then sudo apt-get update

For more up-to-date nvidia drivers, you need to add another PPA. As of 12.04, this is still necessary for Nvidia GT 6xxM cards. It may be optional for the GT 4xxM and GT 5xxM series on 12.04. When in doubt, just install it. The command is:

sudo add-apt-repository ppa:ubuntu-x-swat/x-updates

sudo apt-get update

  1. To install Bumblebee using the proprietary nvidia driver:

    sudo apt-get install bumblebee bumblebee-nvidia linux-headers-generic

  2. Reboot.

If you just want to disable nvidia card, no need to learn followings

Usage Instruction :

To run a program with nvidia card, use optirun command prefixed in terminal. Like to run glxspheres with nvidia card type

optirun glxspheres

To run firefox type : optirun firefox &

Note: If you intend to run 32-bit programs like Wine and using Ubuntu 11.10 Oneiric or later, install 32-bit libraries with: sudo apt-get install virtualgl-libs:i386 libgl1-mesa-glx:i386 libc6:i386

Linked Questions:

How well will Nvidia Optimus cards be supported in 12.04?

How well do laptops with Nvidia Optimus work?

Can't use nvidia card/driver on optimus notebook

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