hdmi.sh

#!/bin/sh

# This file sets the hdmi output and frame buffer to the argument in pixel width.
# Allowed argument example ./hdmi.sh 720 <-- For width 720 pixels.

# set -x #echo on

bpp=32
hz=60

i=$1

case $i in
    480|720|1080|2160)
       w=$(($i*16/9))
       di=$(($i*2))
       w1=$(($w-1))
       i1=$(($i-1))
       fbset -fb /dev/fb0 -g $w $i $w $di $bpp
       fbset -fb /dev/fb1 -g 32 32 32 32 32
       mode=$(echo "${i}p${hz}hz")
       echo $mode > /sys/class/display/mode
       echo 0 > /sys/class/graphics/fb0/free_scale
       echo 1 > /sys/class/graphics/fb0/freescale_mode
       echo 0 0 $w1 $i1 > /sys/class/graphics/fb0/free_scale_axis
       echo 0 0 $w1 $i1 > /sys/class/graphics/fb0/window_axis
       echo 0 > /sys/class/graphics/fb1/free_scale
       ;;
esac

# Enable framebuffer device
echo 0 > /sys/class/graphics/fb0/blank

# Blank fb1 to prevent static noise
echo 1 > /sys/class/graphics/fb1/blank