[PATCH v2 0/1] Correct Video Corruption for EFI Plus Bochs/Cirrus

[Andrew Hamilton <adhamilt@gmail.com>]

Disable building video_bochs and video_cirrus for EFI x86 platforms (i386_efi
and x86_64_efi). For x86 EFI platforms efi_gop or efi_uga should provide the
video support. Currently, in EFI platforms there is a risk that both the
legacy device is present and the EFI video interface - which can cause
unexpected video corruption when a mix of the two interfaces are used. This
can happen when all_video is loaded for simplicity in a GRUB config.

There is some additional analysis from the Qemu team in this thread:
https://gitlab.com/qemu-project/qemu/-/issues/2562

This is an issue on some major distros such as Debian on EFI
when running under Qemu and potentially other scenarios.

There is some discussion on the Debian side in this thread:
https://salsa.debian.org/kernel-team/linux/-/merge_requests/1453

This relates to this discussion from grub-devel also:
https://lists.gnu.org/archive/html/grub-devel/2025-09/msg00244.html

Following this change, for x86_64_efi the following modules would
be loaded by "all_video": "efi_gop" "efi_uga"

Link to v1 thread:
https://lists.gnu.org/archive/html/grub-devel/2025-09/msg00254.html

Fixes: https://savannah.gnu.org/bugs/index.php?66200

Changes v1 => v2:
Also remove video_cirrus when building for i386 EFI or x86-64 EFI

Andrew Hamilton (1):
  build: Disable building video_bochs/cirrus for EFI x86 platforms

 grub-core/Makefile.core.def | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

-- 
2.47.3


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