I have a 4k laptop and 4k external display connected through HDMI.

If I connect the display, then boot up the system, it detects it just fine, and works. But when I connect it after boot, it doesn't get detected. The "Detect Displays" button in System Settings does nothing. How to make it detect it?

If the automatic detection after boot is currently buggy, is there a command to redetect displays? (Presumably the same way the system does on boot?)

  • OS: elementary OS 0.4.1 Loki x86_64
  • Kernel: 4.13.10-041310-generic

I also have the elementary-os/daily PPA installed.

1 Answer 1


I don't know why or when, but it sorted itself - probably one of the daily patches. Thanks, eOS team!

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.