How to use only intel graphics and power off radeon?

Posted by luizrogeriocn on Ask Ubuntu See other posts from Ask Ubuntu or by luizrogeriocn
Published on 2014-06-05T00:29:35Z Indexed on 2014/06/05 3:39 UTC
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I've been using Linux for quite a while in everyday computing and programming. But now i got this new laptop with amazing battery life on windows which runs pretty cool even while gaming. But for some reason on Ubuntu I get like 1/3 battery life and it gets hot even while browsing the web.

I have the proprietary drivers for radeon, but I'm thinking about upgrading from Ubuntu 12.04 to 14.04, and I would like to know how can I use only the Intel graphics and have radeon always turned off? Since I do not need the discrete graphics on Ubuntu and I'm pretty sure my problem is related to the radeon sucking up my battery and generating heat.

My laptop technical specifications are:

Dell latitude 3540
Intel core i7 4500U (with Intel hd4400 graphics )
Ati Radeon HD 8850m with 2GB GDDR5 VRAM
8 GB DDR3L @1600mhz
Toshiba 256gb SSD
Ubuntu 12.4.3

If you need any additional info, please tell me :)

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