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.