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util/grub.d/00_header.in: Disable loading all_video for EFI

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Loading all_video for EFI can cause video issues in some cases
since GRUB Bochs/Cirrus drivers may conflict with native EFI drivers.
Change default behavior for EFI to only load EFI specific video
modules. Also include a new environment variable to restore the old
behavior if needed.

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

Signed-off-by: Andrew Hamilton <adhamilt@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Andrew Hamilton 2025-11-06 18:24:33 -06:00 committed by Daniel Kiper
parent 73dee610b1
commit ea0b76dc4a
3 changed files with 24 additions and 2 deletions
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7
docs/grub.texi
View File

@ -1642,6 +1642,13 @@ This option is unset by default, and is deprecated in favour of the less
confusing @samp{GRUB_TIMEOUT_STYLE=countdown} or
@samp{GRUB_TIMEOUT_STYLE=hidden}.
@item GRUB_FORCE_EFI_ALL_VIDEO
When set to true, this will allow grub-mkconfig to generate a GRUB config
that supports loading the all_video module on the EFI platform instead of
just the efi_gop and efi_uga modules.
This option is unset by default.
@end table
For more detailed customisation of @command{grub-mkconfig}'s output, you may

3
util/grub-mkconfig.in
View File

@ -255,7 +255,8 @@ export GRUB_DEFAULT \
GRUB_ENABLE_CRYPTODISK \
GRUB_BADRAM \
GRUB_OS_PROBER_SKIP_LIST \
GRUB_DISABLE_SUBMENU
GRUB_DISABLE_SUBMENU \
GRUB_FORCE_EFI_ALL_VIDEO
if test "x${grub_cfg}" != "x"; then
rm -f "${grub_cfg}.new"

16
util/grub.d/00_header.in
View File

@ -124,10 +124,24 @@ if [ -n "${GRUB_VIDEO_BACKEND}" ]; then
insmod ${GRUB_VIDEO_BACKEND}
EOF
else
# For EFI, use EFI video drivers only by default to avoid conflict between
# GRUB Bochs/Cirrus and native EFI drivers. If GRUB_FORCE_EFI_ALL_VIDEO is
# set/true then defer back to all_video even for EFI.
if [ "${GRUB_FORCE_EFI_ALL_VIDEO}" = "1" ]; then
cat <<EOF
if [ x\$feature_all_video_module = xy ]; then
EOF
else # GRUB_FORCE_EFI_ALL_VIDEO is not set true
cat <<EOF
if [ x\$grub_platform = xefi ]; then
insmod efi_gop
insmod efi_uga
elif [ x\$feature_all_video_module = xy ]; then
EOF
fi # end GRUB_FORCE_EFI_ALL_VIDEO
# If all_video.mod isn't available load all modules available
# with versions prior to introduction of all_video.mod
cat <<EOF
if [ x\$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop