On the Steam Deck using an external HDMI display:
If you start Factorio while in Desktop Mode the game will run at your native resolution. However, if you start the game under Gaming Mode it will run at a lower resolution (my guess is the built-in 800p). It would be much appreciated to have the resolution adapt in Gaming Mode if an external display is attached/detached, that way Deck users can switch to/from a dock without having to stop, change modes and relaunch the game.
This occurred with both the official Steam Deck Docking Station and a portable Anker dock on my 1440p monitor (likely occurs at other resolutions but i only have this to test on).
Absolutely love the game though. Already sunk 500hrs into my first save and finally almost at 1.2kspm (curse you, modules!)
![Smile :-)](./images/smilies/icon_e_smile.gif)