No monitor recognition

General system Kernel, boot, graphics & hardware
3

I just recently posted an issue with monitors on Displayport. No displayport signal after boot when monitor was off

During my investigation I found that the Displayport is initialized once during boot. If no monitor is available during that time the Displayport will not have any signal. I am not sure if that is the case for all graphics adapters but it is certainly the case for many of them.

If that happens to you, you can manualy initialize the Displayport

  1. xrandr --listmonitors
    this lists all monitors with port name

  2. xrandr --output DisplayPort-1 --auto
    will initialiuze the displayport again. DisplayPort-1 is the port name shown by the first command.

You can try that and see if it helps.