Use /boot/initrd.gz and /boot/initrd-$version a valid initrd names, load the
modules all_video of linux entries in /etc/grub.d/3O_os-prober
Didier Spaier
diff -ru grub-gite7b8856f8/util/grub.d/10_linux.in grub-gite7b8856f8.new/util/grub.d/10_linux.in
--- grub-gite7b8856f8/util/grub.d/10_linux.in	2020-07-29 16:55:48.000000000 +0200
+++ grub-gite7b8856f8.new/util/grub.d/10_linux.in	2020-09-06 19:47:26.921058700 +0200
@@ -218,7 +218,8 @@
 	   "initramfs-genkernel-${version}" \
 	   "initramfs-genkernel-${alt_version}" \
 	   "initramfs-genkernel-${GENKERNEL_ARCH}-${version}" \
-	   "initramfs-genkernel-${GENKERNEL_ARCH}-${alt_version}"; do
+	   "initramfs-genkernel-${GENKERNEL_ARCH}-${alt_version}" \
+	   "initrd-generic-${version}" "initrd.gz"; do
     if test -e "${dirname}/${i}" ; then
       initrd_real="${i}"
       break
diff -ru grub-gite7b8856f8/util/grub.d/30_os-prober.in grub-gite7b8856f8.new/util/grub.d/30_os-prober.in
--- grub-gite7b8856f8/util/grub.d/30_os-prober.in	2020-07-29 16:55:48.000000000 +0200
+++ grub-gite7b8856f8.new/util/grub.d/30_os-prober.in	2020-09-06 19:49:47.773062730 +0200
@@ -245,6 +245,7 @@
 	if [ "x$is_top_level" = xtrue ] && [ "x${GRUB_DISABLE_SUBMENU}" != xtrue ]; then
             cat << EOF
 menuentry '$(echo "$OS $onstr" | grub_quote)' $CLASS --class gnu-linux --class gnu --class os \$menuentry_id_option 'osprober-gnulinux-simple-$boot_device_id' {
+	insmod all_video
 EOF
 	    save_default_entry | grub_add_tab
 	    printf '%s\n' "${prepare_boot_cache}"
@@ -265,6 +266,7 @@
 	title="${LLABEL} $onstr"
         cat << EOF
 	menuentry '$(echo "$title" | grub_quote)' --class gnu-linux --class gnu --class os \$menuentry_id_option 'osprober-gnulinux-$LKERNEL-${recovery_params}-$boot_device_id' {
+		insmod all_video
 EOF
 	save_default_entry | sed -e "s/^/$grub_tab$grub_tab/"
 	printf '%s\n' "${prepare_boot_cache}" | grub_add_tab