I got a Toshiba Satellite L850-150 (PSKDLE) with its Intel i7 3610QM and AMD RADEON 7670M. I have the same problem, the computer only detects the AMD graphics card and I can't find the way to activate the Intel HD Graphics 4000.
Why do they disable the intel graphics card? could it be enabled by a BIOS update someday?
Did you read the other posting above?
It’s not possible to switch to Intel. These is not available for notebooks with ATI GPU!
Using nVidia Optimus technology you could choose an GPU for a single application.
So for example you could configure your Photoshop application (just for example) to use the Intel HD GPU instead of nVidia… but as mentioned, this is possible ONLY for nVidia GPU!