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.

I use EXWM and three monitors, so knowing my window numbers is crucial to my navigation. I used to use Ace Window to present a red digit at the corner of emacs screens with which number to press to get there. The two problems with this are that you can’t know your numbers until you invoke Ace Windows, and more damningly, you can’t get these numbers on exwm (non-emacs) windows, such as my ever-present browsers.

I recently shuffled things with my office and found that I have hardware and ports for a third monitor to connect to my exwm setup. So, without further ado, how to get it going and registered with Linux/EXWM? Edit [2022-01-02 Sun] an easier way with arandr Downloading and installing arandr made this whole configuration much simpler than using the raw randr output. I finally made the jump when I was receiving an error at my attempts to load it manually: xrandr: Configure crtc 2 failed.