I’ve had the same problem with 3 different 2011 MacBook Pros There’s an nvram variable you can change to disable the discrete gpu, details here: https://apple.

I’ve had the same problem with 3 different 2011 MacBook Pros There’s an nvram variable you can change to disable the discrete gpu, details here: https://apple.stackexchange.com/questions/166876/macbook-pro-how-to-disable-discrete-gpu-permanently-from-efi#285896 https://apple.stackexchange.com/questions/166876/macbook-pro... I didn’t go the Linux-live cd route so I have to reapply the fix when nvram is reset but other than that the machines work fine now :)