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

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Message-ID: <CAMj1kXEP=nByL5+R2Ch-PLSKnziEyyK_rLZL=wcvKRNcBPTJbg@mail.gmail.com>
Date: Mon, 3 Nov 2025 14:11:31 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Francesco Pompò <francescopompo2@...il.com>
Cc: linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] efistub/smbios: Add fallback for SMBIOS record lookup

On Mon, 3 Nov 2025 at 11:15, Francesco Pompò <francescopompo2@...il.com> wrote:
>
> 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.

You meant MacbookPro11,3, right?