echo 720p50hz > /sys/class/display/mode
echo 0 0 1279 719 > /sys/class/graphics/fb0/free_scale_axis
echo 40 30 1239 689 > /sys/class/graphics/fb0/window_axis
echo 0x10001 > /sys/class/graphics/fb0/free_scale
echo 1 > /sys/class/graphics/fb1/blank
or possibly
echo 720p50hz > /sys/class/display/mode
echo 0 > /sys/class/ppmgr/ppscaler
echo 0 > /sys/class/graphics/fb0/free_scale
echo 1 > /sys/class/graphics/fb0/freescale_mode
echo 0 0 1279 719 > /sys/class/graphics/fb0/free_scale_axis
echo 40 30 1239 689 > /sys/class/graphics/fb0/window_axis
echo 0x10001 > /sys/class/graphics/fb0/free_scale
echo 1 > /sys/class/graphics/fb1/blank
then tell me
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