The dual graphics GPU on the MacBook Pro 15” can be permanently disabled or treated with a software fix.
Here’s a video on doing it '''permanently'''
https://www.youtube.com/watch?v=vbXb0gfRxEY
Here’s the '''software fix''' which I have used on about a dozen machines now to get them back to functionality:
'''gfx card status'''
https://gfx.io