Push handheld-arguments to allow arguments to be changed post-install

usr/lib/sdboot-manage.conf.d/handheld-arguments

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+#Send no arguments by default
+APPENDED_LINUX_OPTIONS=""
+
+#Check for legacy installs to not duplicate kernel arguments
+LEGACY=false
+if grep "fbcon=vc:2-6" /etc/sdboot-manage.conf; then
+    LEGACY=true
+fi
+
+SYS_ID="$(cat /sys/devices/virtual/dmi/id/product_name)"
+
+
+#Steam Deck OLED and LCD
+if [[ ":Jupiter:Galileo:" =~ ":$SYS_ID:" ]]; then
+    if ! "$LEGACY"; then
+        APPENDED_LINUX_OPTIONS="fbcon=vc:2-6 amd_iommu=off amdgpu.gttsize=8128 spi_amd.speed_dev=1 audit=0 iomem=relaxed amdgpu.ppfeaturemask=0xffffffff"
+    fi
+#ROG Ally
+elif [[ "$SYS_ID" =~ (ROG\ Ally).*  ]]; then
+    if ! "$LEGACY"; then
+        APPENDED_LINUX_OPTIONS="fbcon=vc:2-6"
+    fi
+#Lenovo legion Go
+elif [[ "$SYS_ID" =~ (83E1) ]]; then
+    if ! "$LEGACY"; then
+        APPENDED_LINUX_OPTIONS="fbcon=vc:2-6 amdgpu.sg_display=0"
+    else
+        APPENDED_LINUX_OPTIONS="amdgpu.sg_display=0"
+    fi
+fi
+
+##############
+# Unset so they dont get used by sd-boot-manager accidently
+unset LEGACY
+unset SYS_ID