Changes the state of the display monitor. The [action]
parameter may contain the following values:
off: Turn off the monitor
on: Turn on the monitor
low: Set the monitor to low power state.
This command only works in systems that support this feature.
If you have a problem that NirCmd remains in memory when using this command, you may try to use async_off, async_on and async_low actions instead of on/off/low actions.