/usr/local/bin/enable-dvi-compatibility.sh

#!/bin/bash

export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

if [ "$(id -u)" != "0" ]; then
        echo "This script must be run as root. Exiting" >&2
        exit 1
fi

Fex2Bin="$(which fex2bin)"
if [ "X${Fex2Bin}" = "X" ]; then
        apt-get -f -q -y install sunxi-tools
fi

Path2ScriptBin="$(df | awk -F" " '/^\/dev\/mmcblk0p1/ {print $6}')"
if [ ! -f "${Path2ScriptBin}/script.bin" ]; then
        echo "Can not find script.bin. Ensure boot partition is mounted" >&2
        exit 1
fi

MyTmpFile="$(mktemp /tmp/${0##*/}.XXXXXX)"
trap "rm \"${MyTmpFile}\" ; exit 0" 0 1 2 3 15

bin2fex <"${Path2ScriptBin}/script.bin" | grep -v "^hdmi_cts_compatibility" >"${MyTmpFile}" || (echo "Could not convert script.bin to fex. Exiting" >&2 ; exit 1)
cp -p "${Path2ScriptBin}/script.bin" "${Path2ScriptBin}/script.bin.bak"

sed -i '/tv_para/i \
hdmi_cts_compatibility = 0\
' "${MyTmpFile}"

fex2bin "${MyTmpFile}" "${Path2ScriptBin}/script.bin" >/dev/null
if [ $? -ne 0 ]; then
        mv "${Path2ScriptBin}/script.bin.bak" "${Path2ScriptBin}/script.bin"
        echo "Writing script.bin went wrong. Nothing changed" >&2
        exit 1
fi

echo "Successfully enabled HDMI -> DVI compatibility. Reboot necessary for the changes to take effect"