./teeworlds "gfx_screen 1"
fails if only one screen is available. It will output
```
[5c67d6e0][client]: starting...
[5c67d6e0][gfx]: unable to retrieve screen information: displayIndex must be in the range 0 - 0
[5c67d6e0][gfx]: lowering FSAA to 1 and trying again
[5c67d6e0][gfx]: unable to retrieve screen information: displayIndex must be in the range 0 - 0
[5c67d6e0][gfx]: disabling FSAA and trying again
[5c67d6e0][gfx]: unable to retrieve...snd_toggle
. Acts the same as toggle snd_enable 0 1
, but with a visual cue.