faq: added an entry about phantom monitor (#667)

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@ -383,3 +383,23 @@ from Steam.
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# Workspaces or clients are disappearing or monitor related dispatchers cause crashes
It seems there is a Kernel bug making the system think there is an extra
phantom monitor, that causes all sorts of issues, crashes and weird behaviors
like disapearing workspaces or clients when adding or removing an external
monitor.
First check the list of monitors detected by Hyprland by running:
```ini
hyprctl monitors
```
If you see a monitor that should not be there (usually named `Unknown-1`), you
can work around the issue by adding in your `hyprland.conf`:
```ini
monitor=Unknown-1,disabled
```