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I am using Ubuntu 12.04 in my HP laptop (A8 processor), It is getting overheated when I use Ubuntu, but when I use Windows it stays cool. I want to switch off my graphics card in Ubuntu. This has to be applied when I shutdown or restart. Currently I'm getting an error saying that GNOME settings not responding and then it is taking long time to shutdown the system.

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If you are using a(an) NVIDIA graphic card , you can use bumblebee to switch on/off your graphic card. See

for more information.

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Check BIOS settings. There could be option to use integrated graphics, instead of graphic card, of-course only if you have on board graphics on motherboard. There could be graphical way or from within Ubuntu, but best thing would be to use BIOS settings.

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