Mutiple monitors

### Bug Description

Operating Ubuntu 24.04 on MacBook Pro vintage 2012 and successfully added Vizio TV as second monitor with MacBook internal monitor as control.. After turning Vizio monitor off in display setup (it disappears as monitor), System will not operate without Vizio TV plugged in and turned on. Boot without Vizio, the program goes to a blank screen until Vizio is plugged in then continues to boot. Back in the multi-display menu, turning off the Vizio monitor and unpluging it produces a blank screen until plugged back in. Although having the Vizio monitor is great, it defeats the mobility of the laptop. So how can I change the multi-monitor mindset of Ubuntu????

### To Reproduce

Add a second monitor
try to return to just the original monitor
program goes to blank screen

### Environment

Not sure about charm, running Ubuntu 24.04 recent update..

### Relevant log output

```shell
No output, only blank screen.
```

### Additional context

_No response_

No synapse-operator files, tests, entry points, or actionable logs are identified. First verify that this Ubuntu display issue belongs in this repository, then reproduce the blank-screen behavior with and without the Vizio monitor; completion would require a confirmed cause and a tested fix or a more appropriate issue location.

Written by the indexing model from the issue text.