diff -Nru nvidia-tegra-defaults-1.2~22.04/debian/changelog nvidia-tegra-defaults-1.3~22.04.1/debian/changelog
--- nvidia-tegra-defaults-1.2~22.04/debian/changelog	2023-09-22 14:18:42.000000000 +0000
+++ nvidia-tegra-defaults-1.3~22.04.1/debian/changelog	2023-10-09 16:51:16.000000000 +0000
@@ -1,8 +1,19 @@
-nvidia-tegra-defaults (1.2~22.04) jammy; urgency=medium
+nvidia-tegra-defaults (1.3~22.04.1) jammy; urgency=medium
 
   * Backport to jammy; LP: #2037096.
 
- -- Loïc Minier <loic.minier@ubuntu.com>  Fri, 22 Sep 2023 14:18:42 +0000
+ -- Loïc Minier <loic.minier@ubuntu.com>  Mon, 09 Oct 2023 16:51:16 +0000
+
+nvidia-tegra-defaults (1.3) mantic; urgency=medium
+
+  * Update GRUB config to set kernel cmdline for both normal and recovery
+    modes.
+  * Remove dependency on GRUB. (LP: #2037653)
+    - Update maintainer scripts to only run update-grub when present.
+  * Add ttyACM0 as an extra console on the kernel cmdline.
+  * Use simplefb framebuffer; disable the EFI framebuffer.
+
+ -- Pedro Kopper <pedro.kopper@canonical.com>  Thu, 28 Sep 2023 10:55:01 -0300
 
 nvidia-tegra-defaults (1.2) mantic; urgency=medium
 
diff -Nru nvidia-tegra-defaults-1.2~22.04/debian/control nvidia-tegra-defaults-1.3~22.04.1/debian/control
--- nvidia-tegra-defaults-1.2~22.04/debian/control	2023-09-18 08:40:56.000000000 +0000
+++ nvidia-tegra-defaults-1.3~22.04.1/debian/control	2023-10-06 15:56:45.000000000 +0000
@@ -8,12 +8,10 @@
 Standards-Version: 4.6.0.1
 
 Package: nvidia-tegra-defaults
-# target platform is arm64 and the GRUB dependency would only work on that
-# arch
+# target platform is arm64
 Architecture: arm64
 Depends:
  ${misc:Depends},
- grub-efi-arm64 (>= 2.0.0),
 Description: Configuration files specific to NVIDIA Tegra boards
  This package provides configuration files useful on NVIDIA embedded boards
  from the Tegra family.
diff -Nru nvidia-tegra-defaults-1.2~22.04/debian/nvidia-tegra-defaults.postinst nvidia-tegra-defaults-1.3~22.04.1/debian/nvidia-tegra-defaults.postinst
--- nvidia-tegra-defaults-1.2~22.04/debian/nvidia-tegra-defaults.postinst	2023-09-14 14:32:22.000000000 +0000
+++ nvidia-tegra-defaults-1.3~22.04.1/debian/nvidia-tegra-defaults.postinst	2023-09-28 13:55:01.000000000 +0000
@@ -2,8 +2,8 @@
 
 set -e
 
-if [ "$1" = configure ]; then
-    update-grub2
+if [ "$1" = configure ] && [ -e /boot/grub/grub.cfg ] && which update-grub >/dev/null 2>&1; then
+    update-grub || true
 fi
 
 #DEBHELPER#
diff -Nru nvidia-tegra-defaults-1.2~22.04/debian/nvidia-tegra-defaults.postrm nvidia-tegra-defaults-1.3~22.04.1/debian/nvidia-tegra-defaults.postrm
--- nvidia-tegra-defaults-1.2~22.04/debian/nvidia-tegra-defaults.postrm	2023-09-13 17:32:57.000000000 +0000
+++ nvidia-tegra-defaults-1.3~22.04.1/debian/nvidia-tegra-defaults.postrm	2023-09-28 13:55:01.000000000 +0000
@@ -4,7 +4,9 @@
 
 case "$1" in
     purge|remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
-        update-grub2
+        if [ -e /boot/grub/grub.cfg ] && which update-grub >/dev/null 2>&1; then
+            update-grub || true
+        fi
     ;;
 esac
 
diff -Nru nvidia-tegra-defaults-1.2~22.04/files/etc/default/grub.d/99-nvidia-tegra-defaults.cfg nvidia-tegra-defaults-1.3~22.04.1/files/etc/default/grub.d/99-nvidia-tegra-defaults.cfg
--- nvidia-tegra-defaults-1.2~22.04/files/etc/default/grub.d/99-nvidia-tegra-defaults.cfg	2023-09-13 17:13:41.000000000 +0000
+++ nvidia-tegra-defaults-1.3~22.04.1/files/etc/default/grub.d/99-nvidia-tegra-defaults.cfg	2023-10-06 15:55:45.000000000 +0000
@@ -1,8 +1,12 @@
 # SPDX: GPL-3.0+
 # Copyright (C) 2023 Canonical Ltd.
 
-# Adds aditional console output on ttyTCU0 to cmdline
-GRUB_CMDLINE_LINUX_DEFAULT="${GRUB_CMDLINE_LINUX_DEFAULT} console=ttyTCU0,115200 console=tty0"
+# Use simplefb framebuffer, disabled efifb as in 5.15 the firmware => linux
+# handoff doesn't work properly
+GRUB_CMDLINE_LINUX="${GRUB_CMDLINE_LINUX} fbcon=map:0 video=efifb:off"
+
+# Enable kernel output and systemd gettys on all serial consoles
+GRUB_CMDLINE_LINUX="${GRUB_CMDLINE_LINUX} console=ttyAMA0,115200 console=ttyTCU0,115200 console=tty0"
 
 # Enables console mode so that we get a menu on the serial port
 GRUB_TERMINAL=console