help: Enable screen blank powersaving on VGA console

create: sudo sh -c \
  "/usr/bin/setterm -blank 15 -powersave powerdown -powerdown 60 -term linux </dev/console >/dev/console 2>&1"
delete: sudo sh -c \
  "/usr/bin/setterm -blank 0 -powersave off -powerdown 0 -term linux </dev/console >/dev/console 2>&1"