I'm not sure, it looks like it just disables the discrete GPU? If so, I've tried that - the problem is there's no other graphics to fall back on, Apple's propr

I'm not sure, it looks like it just disables the discrete GPU? If so, I've tried that - the problem is there's no other graphics to fall back on, Apple's proprietary EFI doesn't let non-OS X systems see that the integrated graphics are present at all (currently running only Windows 10 on it since I need Visual Studio). Maybe the patched Grub might be the start of a solution (could run Windows with a VM in Linux) but I'm not sure I'm that brave - last time I tried messing around with Apple's EFI for multi-booting it didn't end well :)