windows 7 - Macbook Pro: disable Win7 discrete GPU with no screen access

Backstory

It's a well-documented problem with Macbook Pro 2011 models that from 2014 onwards, the discrete GPUs that are automatically activated and deactivated (or whatever, I'm not going to pretend I know all the words) have started burning out, dieing and generally being a pain.

Last week it happened to mine, and after learning about the problem and figuring it out, I disabled (i.e. moved the files) the AMD + ATI GPU drivers on my OSX partition to the desktop, via single user mode to prevent the discrete GPU from firing up at launch.

Result: my Macbook Pro lives on, powered by the integrated graphics.

The Problem

I now wish to boot up into my Windows 7 (Bootcamp-augmented) system, but when it starts, the screen cuts to black, signalling to me at least that it too is trying to utilise the dead discrete GPU.

Required help

So, without getting to the Win7 desktop, I need to somehow disable/delete/move whatever drivers/settings are allowing Windows 7 to use the discrete GPU, and force it to instead rely ONLY on the integrated graphics.

Is there a way to do this with a Win7 equivalent of Mac's single user/shell mode?

Key details / tl;dr

• Macbook Pro 2011; OS 10.8 and Win7 partitions
• Discrete GPU is bust; OSX relying on integrated graphics, Win7 still trying to use bust GPU
• Black screen on Windows 7 boot; no control
• How do I disable discrete GPU, force win7 to use integrated graphics, with no screen access to system?

Sucks to hear about your graphics controller! You can run Windows 7 using the default Microsoft Standard VGA driver.

Here's how to rip out the discrete graphics controller:

1. F8-Boot Windows 7 and choose safe mode.
2. Go to Device Manager and double-click your display driver (ATI or nVidia depending on your Mac.
3. Choose the Driver tab and hit update Driver.
4. Hit Browse my computer for driver software.
5. Hit Let me pick from a list of device drivers on my computer.
6. Choose the Microsoft Standard VGA Graphics Adapter (you may have to uncheck show compatible hardware and drill down to it manually.
7. Hit next, then close, and restart normally.

That should do it.

NOTE: When running in BIOS emulation mode, Apple completely masks out the Intel GPU hardware so only the discrete hardware is seen. When running in EFI mode, Apple maps the I/O ranges into the same address space for both adapters, and their ACPI/EFI implementation is incomplete. Long story short, it is not physically possible to use the Intel GPU in Windows on Macs that have discrete graphics -- period. Not through BootCamp, not through a manual Win7 install, and not though an EFI boot either.