linux-kernel - Re: [PATCH v3 0/2] efi/x86: Call set

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Message-ID: <ZqEroUgkB-J-JG4D@wunner.de>
Date: Wed, 24 Jul 2024 18:28:17 +0200
From: Lukas Wunner <lukas@...ner.de>
To: Aditya Garg <gargaditya08@...e.com>
Cc: Ard Biesheuvel <ardb@...nel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Kerem Karabay <kekrby@...il.com>,
	Orlando Chamberlain <orlandoch.dev@...il.com>,
	"sharpenedblade@...ton.me" <sharpenedblade@...ton.me>
Subject: Re: [PATCH v3 0/2] efi/x86: Call set_os() protocol on dual GPU Macs

On Wed, Jul 24, 2024 at 04:21:03PM +0000, Aditya Garg wrote:
> https://www.phoronix.com/forums/forum/software/general-linux-open-source/1479158-linux-6-11-efi-will-fake-that-it-s-booting-apple-macos-to-fix-some-dual-gpu-macs?p=1479205#post1479205
> 
> By looking at this post, it seems to affect non T2 Macs as well.

Disabling iGPU if dGPU is present was a behavior that existed well
before T2 Macs, yes.  That affected MacBook Pros from Haswell onward.

However the question is since when iGPU is disabled if an eGPU is present.
I had never heard of this before.  It would be good to have more datapoints
to come up with a quirk that's as narrowly applied as possible to avoid
regressions.

Thanks,

Lukas