linux-kernel - Re: [PATCH] efistub/smbios: Add fallback for SMBIOS record lookup

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Message-ID: <CADr=TJdTcss14P43_jAj4tsEYukt=Z18SnjUNqMD95O_5KkNVA@mail.gmail.com>
Date: Mon, 3 Nov 2025 11:14:47 +0100
From: Francesco Pompò <francescopompo2@...il.com>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] efistub/smbios: Add fallback for SMBIOS record lookup

Il giorno lun 3 nov 2025 alle ore 09:19 Ard Biesheuvel
<ardb@...nel.org> ha scritto:
>
> Hello Francesco,
>
> On Sun, 2 Nov 2025 at 01:14, Francesco Pompo <francescopompo2@...il.com> wrote:
> >
> > Some UEFI firmware implementations do not provide the SMBIOS Protocol,
> > causing efi_get_smbios_record() to fail. This prevents retrieval of
> > system information such as product name, which is needed by
> > apple_set_os() to enable the integrated GPU on dual-graphics Intel
> > MacBooks.
> >
> > Add a fallback that directly parses the SMBIOS entry point table when
> > the protocol is unavailable. Log when the fallback is used.
> >
> > Signed-off-by: Francesco Pompo <francescopompo2@...il.com>
> > ---
> >  drivers/firmware/efi/libstub/efistub.h | 17 +++++
> >  drivers/firmware/efi/libstub/smbios.c  | 99 +++++++++++++++++++++++++-
> >  2 files changed, 113 insertions(+), 3 deletions(-)
> >
>
> On which platform does this fix an actual existing issue?

Hello Ard,

My Macbook Pro Late 2013, product name Macbook11,3 is affected.
Specifically at least the firmware version 478.0.0.0.0, released on
01/13/2023. I have no way to downgrade to check for other versions.

>From what I have read on internet this should not be the only model to
be affected.

The issue is that apple_match_product_name() fails to obtain its info
via efi_get_smbios_record() and makes apple_set_os() fail too.

-- 
Francesco Pompo'