[PATCH 1/3] util/grub.d/00_header.in: Disable loading all_video for EFI

[Andrew Hamilton <adhamilt@gmail.com>]

Loading all_video for EFI can cause video issues in some cases
since bochs / cirrus may conflict with them. 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/index.php?66200

Signed-off-by: Andrew Hamilton <adhamilt@gmail.com>
---
 util/grub.d/00_header.in | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/util/grub.d/00_header.in b/util/grub.d/00_header.in
index 9d36feda3..a4a516aec 100644
--- a/util/grub.d/00_header.in
+++ b/util/grub.d/00_header.in
@@ -124,10 +124,24 @@ if [ -n "${GRUB_VIDEO_BACKEND}" ]; then
   insmod ${GRUB_VIDEO_BACKEND}
 EOF
 else
+# For EFI, use EFI video by default to avoid conflict between
+# bochs / cirrus and EFI video. If GRUB_FORCE_EFI_ALLVIDEO is
+# set/true then defer back to all_video even for EFI.
+if [ "${GRUB_FORCE_EFI_ALLVIDEO}" = "1" ]; then
+    cat <<EOF
+  if [ x\$feature_all_video_module = xy ]; then
+EOF
+else # GRUB_FORCE_EFI_ALLVIDEO 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_ALLVIDEO
 # 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
-- 
2.43.0


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