This page and scroll down past the list to the blog: The use of ArchLinux bootable CD to gain access to and re-write the EFI on the drive, and permanently disable the discrete graphics chip. I used the second from MacRumors as it seemed easier. I have made the Arch Linux bootable CD on another Mac, and tried this approach. I now have a perfectly-functioning MacBook Pro late 2011 15-in model with Discrete Graphics disabled. But NO external display support any more. There is a completely different hack developed more recently. It requires only single-User mode to get started, then type a complicated string into NVRAM, then disable System Integrity Protection and run an additional little program (direct-download link provided there) to make the change semi-permanent.GfxCardStatus is an open-source menu bar application that keeps track of which graphics card your dual-GPU (late 2008/2009 w/ 9400M/9600M GT, or 2010 i5/i7 w/ Intel HD/330M) MacBook Pro is using at any given time, and allows you to switch between them on demand. Simple, clean "i" and "n" icons that signify Intel? HD Graphics, and NVIDIA? GeForce GT 330M graphics, respectively.Automatically updates when the GPU switches, in real time.
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