zsh -c """
echo 'dbg_msg: initial values'
date -u
tail -n '+0' /sys/kernel/debug/dri/0/i915_display_info
intel_reg dump
for i in 0 1; do;
  echo 'dbg_msg: turn off display power';
  date -u
  read -E
  intel_reg dump
  tail -n '+0' /sys/kernel/debug/dri/0/i915_display_info
  echo 'dbg_msg: turn on display power';
  date -u
  read -E
  intel_reg dump
done;
""" | tee i915_live_test.txt