Setting up a dual monitor setup in Linux with i3wm can be challenging, but with the right tools and configurations, it's achievable. The article discusses two main issues that users may encounter when setting up their extended monitors: disconnecting the external monitor and adjusting DPI settings to match between the laptop and external monitor.

To resolve these issues, the author suggests using xrandr to detect and adjust the DPI settings for the 4K monitor, creating a .Xresources file in the home directory, and merging it with xrdb. This allows users to set their desired DPI resolution for both monitors.

Additionally, the article highlights the importance of setting up shortcuts in i3wm configuration to allow users to quickly switch between working on individual monitors or using them together. The author shares their own experience and shortcut setup, which includes three different combinations: working only with the extended monitor, only with the laptop, or simultaneously with both.

Source: https://dev.to/sureshsaragadam/dual-monitor-setup-in-linux-in-i3wm-7f