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Switchable Graphics Not Working (660M/HD4000)

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I have been having issues getting the switchable graphics on my R4 to work as expected. It has not worked for a while so I have just been using the discrete card only, but I would like to figure out what is going on.

I have the i7 3610QM (HD Graphics 4000) and a GTX 660M discrete card.

Everything works fine if I leave the internal disabled and only use the 660. When I enable the switchable graphics, everything is rendered with the internal card and the 660 does not seem to be used at all. The driver is installed and updated and the 660 is selected in the NVIDIA Control Panel, but HWInfo64 shows the card with no other data being reported for it. NvStateViewer shows the state as off.

I am unsure as to whether this will help or not, but this is what shows up in the Physx configuration page:


Versus when only the 660 is enabled:


Dell had replaced my motherboard and the graphics card a couple years ago for issues with graphical artifacts, but I can't recall if the switchable graphics had stopped working at that point or sometime after (I realize I probably should have looked into it and gotten Dell to deal with it back then but it's a bit late for that now).

I had been running BIOS A12 but recently flashed A11 unlocked.

I also just reinstalled Windows with the factory Alienware image and installed the recommended graphics driver from the Dell site, no change.

Any ideas? Any further information that might help?


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