I've already posted this to Intel's forums and had no answer given: http://communities.intel.com/message/165285#165285
So I recently bought an Inspiron 17R with Intel HD 4000 / nVidia GT 630M and I already hate Intel/Dell guts. The picture quality of Intel's iGPU is [censored] horrible and Dell does not allow you to force discrete graphics in BIOS. Please either release a fix for dithering on iGPUs or even better, let us force a proper GPU in BIOS, currently this option is not there on Dell's BIOS.
I am starting to think of returning this Dell laptop and getting an Acer or whatever because they allow forcing a proper GPU in BIOS.
There is no way to disable the Intel GPU.
There was a BIOS switch in my old laptop, and according to some Googling there used to be one in Dell laptops until they removed it from their BIOS.
Just found out that once upon a time in the past Dell had released a BIOS upgrade for Vostro 3550 to bring back the most critical switch in BIOS:
Can we pretty please have the same thing done for Inspiron 5720?
There's a problem with dithering on my new Inspiron 17R SE Premium, so I would really like to have this option. Or at least having a fix for the Intel HD Graphics 4000 drivers.
I am going to install the new A03 BIOS, but I don't think it will give me a solution. So I really hope a future update will correct this issue.
Took the laptop to a Dell SC. They refused to listen about dithering and iGPU and just ordered a new display. I REALLY hope that they are right.