[Bug 215003] apple_gmux fails to initialize and iGPU unclaimed on MacBook Pro 16" 2019

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215003

--- Comment #7 from Lukas Wunner (lukas at wunner.de) ---
The gpu-switch utility I've linked to above has macOS and Windows versions. You
could try using it from one of those OSes to switch to the iGPU on next boot,
then boot into Linux.

Perhaps you could add a few debug printk's to find out which runtime services
call causes the crash.

In summary, there are two issues here: The EFI issue which prevents you from
switching to the iGPU on Linux, and the GMUX incompatibility.  You may want to
open a separate bug for the former and assign it to the "EFI" Product so that
Ard Biesheuvel and others can take a look.

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