How to force my laptop to use the discrete GPU?

Posted by Anton Roth on Super User See other posts from Super User or by Anton Roth
Published on 2012-10-08T13:24:22Z Indexed on 2012/10/08 15:42 UTC
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windows-7

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gpu

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sandy-bridge

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optimus

My laptop (Asus X7BSV) is stuck using only the integrated GPU. It has a nVidia GT540M as well, but I cannot get it to work.

I am using a Windows 7 x64 with latest drivers.

This occurred after I attached an external USB monitor I need for work, and since then I cannot swap back to the nVidia GPU (dxdiag for example says that the primary GPU is the Intel integrated one).

Asus support asked me to completely reinstall the system, but that is something I do not want to do. I checked the BIOS, there is no option as to what GPU to use. The nVidia card itself is working, since I can use CUDA on it, and it worked with a Ubuntu Live CD. In the nVidia software management I tried setting it to global setting, high performance GPU (nVidia), but that had no impact.

What am I missing here? I did uninstall/delete all drivers and software related to the external monitor, but that did not help.

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