Something

#!/bin/bash
set -e -E

RADEON_DUMP=../radeon_dump
ATICONFIG=aticonfig

LAST=1
$ATICONFIG --set-powerstate=$LAST || true

foo() {
  sleep 0.1
  sudo $RADEON_DUMP > before.$LAST-$1.$RUN
  $ATICONFIG --set-powerstate=$1 || { echo ERROR: aticonfig returned $? !; exit 1; }
  sleep 0.1
  sudo $RADEON_DUMP > after.$LAST-$1.$RUN
  if diff -q before.$LAST-$1.$RUN after.$LAST-$1.RUN > /dev/null; then
    echo WARNING: no change in {before,after}$LAST-$1.$RUN
  fi
  LAST=$1
}

for (( RUN=1; RUN<10; ++RUN )); do
  foo 2
  foo 3
  foo 2
  foo 1
done

echo Success.