#!/bin/bash
# Blank/unblank cycle reproducer for the MIPI flicker investigation.
# Each iteration: blank the display, wait 1s, unblank, wait 3s.
# Watch the screen and count cycles that produced visible flicker.

N=${1:-30}
for i in $(seq 1 $N); do
    echo "--- cycle $i / $N ---"
    echo 4 > /sys/class/graphics/fb0/blank
    sleep 1
    echo 0 > /sys/class/graphics/fb0/blank
    sleep 3
done
echo "done."