linux-kernel - Re: [PATCH v2 08/10] efi: Support EDID information

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Message-ID: <CAMj1kXFtsneE3dFgUx6Hd=iBhD8YpvjfTSi-KZpuNaXfX07KyA@mail.gmail.com>
Date: Mon, 24 Nov 2025 18:04:36 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Thomas Zimmermann <tzimmermann@...e.de>
Cc: javierm@...hat.com, arnd@...db.de, richard.lyu@...e.com, x86@...nel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-efi@...r.kernel.org, loongarch@...ts.linux.dev, 
	linux-riscv@...ts.infradead.org, dri-devel@...ts.freedesktop.org, 
	linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org, 
	linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v2 08/10] efi: Support EDID information

On Mon, 24 Nov 2025 at 18:01, Ard Biesheuvel <ardb@...nel.org> wrote:
>
> On Mon, 24 Nov 2025 at 17:52, Thomas Zimmermann <tzimmermann@...e.de> wrote:
> >
> > Add LINUX_EFI_PRIMARY_DISPLAY_TABLE_GUID to the list of config-table
> > UUIDs. Read sysfb_primary_display from the entry. The UUID has been
> > generated with uuidgen.
> >
> > Still support LINUX_EFI_SCREEN_INFO_TABLE_GUID as fallback in case an
> > older boot loader invokes the kernel.
> >
> > If CONFIG_FIRMWARE_EDID=n, EDID information is disabled.
> >
> > Make the Kconfig symbol CONFIG_FIRMWARE_EDID available with EFI. Setting
> > the value to 'n' disables EDID support.
> >
> > Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
>
> Why are we adding a new config table again?
>
>

Note that LINUX_EFI_SCREEN_INFO_TABLE_GUID is internal ABI only
between the EFI stub and the core kernel.