I have a 3-monitor setup, using a USB3 dock. Plugging in to my windows machine just works; all monitors connect. However, plug in into my exwm machine sometimes fails, where the extra monitors will remain blank. Usually this is easily fixed when I see it; I press C-M- to open up a terminal outside exwm, and all monitors come alive; then C-M- back to exwm and it finds them, and all workspaces are where they should be. But it would be nice if it were automatic.

Does anyone know why this is? Is it something about XELB?

Posted on r/EXWM¹

Footnotes

¹ This forum should be useful, since exwm is not directly maintained. https://www.reddit.com/r/EXWM/comments/mw4fso/why_does_exwm_sometimes_fail_to_connect_to_extra/