[Bug 88861] [efi, i915, vgaswitcheroo, black screen, nouveau] Screen goes black when switching from dedicated nvidia graphics card (nouveau) to integrated

[bugzilla-dae...@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=88861

--- Comment #21 from Lukas Wunner <lukas at wunner.de> ---
If you revert 4eebd5a4e7269 ("apple-gmux: lock iGP IO to protect from vgaarb
changes") instead of 704ab614ec12, does the issue go away?

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4eebd5a4e7269

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